I think they are owned by Rite Aid and Eckerd's now. Other than that i've seen them for sale at Big Y (i donno if you have those in your area) but Big Y i believe, and i could be wrong, is owned by the company that owns CVS. Hmmm, i could just have all this stuff by me because of the Big Eastern.
As for tank size. Even at 10 gal they would be fine, i just like bigger areas for my snakesAnything with a floor space of a 10 gal or 20l would be great.