HD has a 1/4" ply, but like DG said, not Birch. It's a China ply. Lots of voids, and very nasty to breathe. Very hard on blades. I get my Baltic Birch from sloanswoodshop.com Great prices and service. Excellent quality Birch ply. Lowes has a 5/32" ply, but has a very thin veneer top and bottom that chips and sands away quickly. Lowes has an Oak 5/32 ply that is nice to work with in 2'x4', 4'x4", and 4'x8'. I just posted 2 projects in the gallery using that Oak ply. Very nice to work with.
Paul