Kind of an oxymoron...custom sump and good price. I've found that going and finding an old scratched up acrylic tank is the best way to go. Or the always trust Rubbermaid tubs are a hit.
I like the idea of trying to find an old scratched up tank. Most have glass though. Must be hard to locate an acrylic tank. I wonder if it would be cheap to go get an old scratched up glass tank and get custom cut pieces that can be glued into the tank for baffles and such.