If you buy 500 I think they cost as low as 11 cents each delivered, I went through a 500 count #0000 case in about 14 months, check it out

http://cgi.ebay.com/500-4-x-8-BUBBLE-MAILERS-ENVELOPES-SHIPPING-SUPPLIES_W0QQitemZ8355021287QQcategoryZ531QQrdZ1QQcmdZViewItem

not my auction