Where to find cheap plywood

[TheKingOfDaFishes]

I was saddened that I was unable to fit another aquarium into my home so I decided to build another L shaped aquarium that could squeeze into the corner. Since just glass is such a pain and so expensive i've decided to make a plywood and glass aquarium. This one will be 5' long on one side and 3' on the other 1' tall and 1' wide (about 50 gallons). I was looking at some 3/4 inch thick oak plywood sheets and all I can find is 4x8 sheets for $50 each. Since I will need around 10 sq feet for the tank plus a lot of the 1/2 inch cheaper plywood for the outside of the stand and drawers (gotta use the space wisely) I'm going to need to find quite a bit of plywood for a cheap price. Would glass be better in the long run? If not where would I find cheap plywood?
Thanks in advance

 

[Bigfishnut]

Your probably not going to find 3/4" hardwood plywood much cheaper than $50 a sheet. It's still cheaper than glass or acrylic. The last plywood tank I built was 6 sheets of 3/4" plywood, 75" × 24" × 1/2" tempered glass, and 40" × 24" × 1/2" tmp. Glass. Plus pond armor, a whole bunch of 2×4's and osb for the stand and a ton of pvc and fittings. Ended up costing over $2000 to finish. Well worth it tho, had to make it to fit a certain spot so I couldn't have bought a tank that would work.

 

[badassissimo]

I'm looking for a build thread for a plywood L tank.