Pretty sure I got mine from Torno Hardware at some point last year - they had to special order a 50lb bag of this.
Full disclosure though - read through this thread to know the "risks" of using the commercial stuff. You'll get some precipitate in the mixing jug due to impurities; Randy notes that this is most likely calcium sulfate.
Torno Hardware
800 Post Road East
Westport, CT 06880
(203) 221-1622
Link: <https://maps.google.com/maps?ie=UTF8&q=westport+hardware&fb=1&gl=us&hq=hardware&hnear=Westport,+Fairfield,+Connecticut&t=h&vpsrc=6&fll=41.136488,-73.3464&fspn=0.02269,0.045447&st=105797168287462989771&rq=1&ev=zi&split=1&ll=41.134549,-73.335629&spn=0.02269,0.045447&z=15&iwloc=A&layer=c&cbll=41.137727,-73.337747&panoid=zsG9r923OC57T4mY4G5Wlg&cbp=12,186.87,,0,0.07&cid=17484668445526849956>
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