$56.99 1/2 in. x 4 ft. x 8 ft. CDX Fire Retardant Douglas Fir Plywood-810FR02CDX50000 - The Home Depot
1/2 in. x 6 in x 16 ft. Lap Siding Pressure-Treated Plywood-481277 - The Home Depot
5/8 in. x 4 ft. x 8 ft. T1-11 8 in. On-Center Ground Contact Pressure-Treated Plywood-246410 
