I searched all over starting in 2001 and settled on this env. to do our mass mailing for the non-profit club buying 500-600 (5 or 6 boxes) a mailing. Since then the prices have gone up steadily (I used to buy at Staples stores for at least 4 years for [$] apiece. They are now in store up to [$] apiece--that's a huge jump from 2001-2005 prices. For this reason I bought from your catalog where the prices are more reasonable. I hope they stay that way.