Does anyone know where I can find PVC sheets, or ABS sheets for a lower price? Right now I'm paying $77 for a sheet of Black 1/4", 4' x 8' sheet of ABS, and $170 for a 1/4", 4' x 8' sheet of PVC. I really can't find anyone with lower prices Can anyone help?

I can't use expanded PVC, as its a junk building material for cages. It sags like crazy, and too wobbly to use for AfRocks.