Hmmm...
Wal-mart around here only sells the automotive epoxies (big selection of JB Weld) and instant/fast-cure epoxies up here.
I did try locating the stuff a couple years ago, but no joy. I did find other Devcon adhesives, but 2-ton was a special-order item (Cisco in Mississauga).
Were you looking for something to create a thermal bog or just forming Sandwiches?