I just picked up some, 3/4", 1/2", and 1/4" Russian Baltic Birch plywood. The 3/4" was $45.00 for a 4X8 sheet. It is so heavy! The real deal. The domestic Maple was $60.00, and not the same quality. It is very good plywood, but is has some voids. The 1/4" only offered in a 5X5 sheet, $15.00. The 1/2" 4X8 sheet was $35.00.
I picked up a 10 BDF of 8/4 White Oak, rough sawn for $6.00 a BDF.

Well worth the 86 mile round trip to get some quality stuff. I won't go for just one sheet. I only needed 1/2 of the 3/4" sheet, I bought 2.
This will last me for a few years, based on my project lineup.