I do build sumps and small acrylic tanks, I do buy acrylic from J.freeman in Dorchester.
Lately, every time I order acrylic I'm getting a different price, the price is going up every week since Katrina, last time I ordered (Wednesday) I paid $ 127 for a 1/4" sheet and $239 for 3/8" sheet, and that is going to be used in a 60x18x20H sump.