actually . . .
when compared to anything similar, they are not that pricey
I can't find a glass or acrylic tank with sliding doors for under $75 - and that's without a top
these seem to come with a top that can even be customized
so the price difference isn't big enough to skimp on the apparent advantages
the shipping adds a bunch and i'm thinking that if there was a way to get around that, such as seeing whether a vendor will bring them to an expo, then the price is not prohibitive
Michael - there's also another company that sells tank frames, but i guess those ventilated corner pieces are pretty unique