Stone Age Tool for the 21st Century -

Retail Outlets
While wholesale-only here, if interested in buying a stone or three here are online and physical store outlets carrying Mt. Shasta pumice. Most offer stones in bulk (not packaged). Some onliners have storefronts as well, and imagine some storefronts also sell online.

Best online deals indicated. Click name to visit any site. Directions for finding stones on sites sometimes indicated, as they're sometimes hidden among mountains of exotic artisan soaps, lotions and such. Some links open directly to pumice offering.
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Online Outlets
 
United States

Fountain Alley Body Care - Madison, IN (small size) -www.allgoodthingshandmade.com
Stephen's Orchard - Bonner Springs, KS - small and medium stones
ChinchillaCity.com - Taylors, SC - "quality toys & supplies" - medium and lg. stones
Body Time - Berkeley, CA -  (small size) www.bodytime.com  Click 'Products', slide down to 'Gifts' and over to 'All gifts'
Mountain Girl Soap & Sundries - Oak Run, CA -  (small size)   a best buy - click 'Products', then 'Accessories'
Flagstaff Soap - Flagstaff, AZ  (small & medium size) a best buy -  enter 'pumice' in search box
Spinster Sisters - Golden, CO -15965 S. Golden Road - large stones
Mystics Hallow - Flippin, Arkansas - 210 E. Main, # 2 - 72634 (small and large economy pumice)
Newport Sea Foam Trading - Newport, RI - (small size) - Click 'Bath Accessories', then scroll
Pure Suds Co- Scranton, PA - (large size)   - enter 'pumice' in search box
Ease Bath & Body - Raleigh, NC  - (medium size) - enter 'pumice' in search box
Chinchilla Rescue - Granby, CT "Sanctuary for   Chinchillas in need" - small, medium stones
The Soap Kitchen - Pasadena, CA - (small and     large size) - enter 'pumice' in search box
Soakology Foot Sanctuary & Teahouse - Portland, ME - (large size) www.soakology.com - click 'Body Care'
Zenabelle - Bristol, RI - (small, medium & large size) - a best buy  - enter 'pumice' in search box
Winnie's RipFix  - Mt. Juliet, TN (crossfitness supplies) small size for hand callouses
Alpine Made LLC - South Wales, NY (large size)  - click 'Shop' and scroll towards bottom; stones on left
Sonoma Soapworks - Sonoma, CA - (medium size) - click 'Extras'
Whimsy's Menagerie & Chinchilla Rescue -  Virginia Beach, VA (small) - click 'Store', then 'Sticks & Stones', and scroll. Offers drilled for making chin gnawing toys, or undrilled
Beyond Botanicals  - Buckeye, AZ - medium size - link opens directly to stones
Complete Naturals Soap - Rathdrum, Idaho - Medium - link opens directly to stones Etsy page
Mountain Madness Soap Company - 117 S. 4th St., Coeur D-Alene, ID - Packaged Lg.
Black Swamp Soap -Waterville, OH - Facebook page - medium stones
E. E. Mercantile & Company - Chicago, IL - packaged stones 
C & G Soapworks -  formerly Richmond, CA, now east coast - medium stones


Canada
The Soap Dispensary - 3623 Main St., Vancouver, BC  (medium size) - Store only www.thesoapdispensary.com 

The Mystic Garden (Facebook) - Thunder Bay, Ontario - medium stones.  Herbs, pagan/wiccan supplies.  Ph: 1-807-983-2122; email: icspots@shaw.ca
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Retail Store Outlets

Northern California
& Southern Oregon
The Weed Store -158 S. Weed Blvd, Weed, CA - small
Emz Blenz Soap Co., 93 Oak St., Ashland, OR
Soul Connections - 329 N. Mt. Shasta Blvd, Mt.  Shasta, CA - medium
River Song Natural Foods - 39057 California, Hwy  299, Willow Creek, CA
Body Time - 3 Bay Area locations -  addresses at www.bodytime.com
Rainbow Grocery Cooperative -1745 Folsom St.,  S.F., CA
Todos Organics - 1150 6th St., Berkeley, CA
Mariposa Natural Foods - 500 S. Main, Willits, CA
Chautauqua Natural Foods - 783 Locust St.,  Garberville, CA
Chico Natural Foods - 818 Main St., Chico, CA
North Coast Co-op - 811 I St., Arcata, CA
Sumbody - 350 Morris St., Sebastopol, CA

Other States
North Shore Soap Factory, Waialua, HI (Oahu)
Palace - S.E. 34th & Belmont, Portland, OR - medium stones
Shore Soap Co. - 415 Thames St., Newport, RI -   med.-small stones
Hollis Pharmacy & General Store - 6 Ash St.,  Hollis, NH
Caribbean Soaps - 1655 Parana St., San Juan, PR
Amy's All Natural, 39 Old Boston Rd., Wilbraham,  MA
Clayton's Way Farm, 17 Peaslee Hill Rd., Weare,  NH
SKINourishment, 691 La Buena Vista Dr., Suite B,  Wimberley, TX
Phoenix Vintage & General Store - 912 N. Hoyne, Chicago, IL
Oisabele - 313 Harrison St., Suite B, Port Clinton,  OH
Mod Gen - 211 N. Broadway St., Milwaukee, WI - sm. and lg. stones
Wai-iti-soaps - PO box 273, occasional booth,  Hanalei, HI (Kauai)
Paisley & Company - 275 West Main St.,  Kutztown, PA
Basin (2) at Disneyworld - 1720 E. Buena Vista   Drive, Lake Buena Vsita, FL; and Basin White,   4401 Floridian Way, Lake Buena Vista, FL -     medium-small stones
Basin Miracle Mile - 2663 Las Vegas Blvd. South,    Las Vegas, NV - medium-small stones
Basin White @ the Venetian Resort - 3377 Las   Vegas Blvd,  Las Vegas, NV - medium small
Remember Yourself - 18 S. Braddock St.,  Winchester, VA
Jivamukti Yoga Center - 841 Broadway, 2nd fl. New York City
Mischievous Moose - 334 N. 1st Ave, Sandpoint,  ID
Beyond Botanicals - 5749 S. 249th Dr.  Buckeye, AZ
Primal Derma - 249 West 123rd St., NYC, NY      medium
Griptastik - 722 Grassmeade Way, Snellville, GA -   for gymnasts - small stones

Canada
The Soap Dispensary - 3623 Main St., Vancouver,  BC 3N6  

Australia
(Google-search for address/venue location)
Scrumpy Soap Co., Donnybrook, Western  Australia
Pure Cheek Soap - Estella, New South Wales
Halka B Organics, Fremantle, Western Australia
Christine Targett - Wyee, N.S.W.
Danielle Honey, Melbourne, Victoria
Sarah Knowler - Karatha, W.A.