For those of us who are enjoying the FAR series from Newegg and Fry's.
Office Depot® Brand All-Purpose Envelopes, #10, 4 1/8" x 9 1/2", White, Box Of 500
-7.50 with 50% discount code.
-0.75 (5% off) for in store pick up
Instruction to get the 50% off code:
Place an order of 4x20 USPS stamps, after the order is placed, on top of the printing receipt page, Office Depot will give you a new code for 50% off in any 500 envelopes order.
Memorize the code, then cancel the stamps order.