I found this Ebay seller that is closing up shop. 500 #000 Bubble Envelopes $20.00 including shipping. That is .04 each. I don't know how many this seller has left. I thought it was a good buy. I ordered today and they informed me they shipped today. We will see if and when the arrive.

Ebay Link
http://cgi.ebay.com/4-x-8-000-Kraft-Bubble-Padded-Envelope-Mailer-500pcs_W0QQitemZ250534812418QQihZ015QQcategoryZ111650QQssPageNameZWDVWQQrdZ1QQcmdZViewItem