I have never used them, but the surplus warehouse in Bryan sells some. I would go look and try to find some that are made with plywood. There are a few folks on here that might make them as well. You said 5 ft of cabinets. Is there a sink or just plain base cabinets?
I used these guys last year for my kitchen cabinets and couldn't be more pleased. I ordered a whole kitchen and pantry worth of JSI cabinets from them.
Went togather nicely with dovetails on drawers and sliding dovetails on the boxes and face frames. Very sturdy.