Leaders of early Wal-Mart said that they made money by saving money. Publishers would do well to follow suit. I find myself mailing hundreds of books to media and potential reviewers, so that buying bubble mailers from office supply stores or even Wal-Mart for $1 or more adds up.
I've been saving 71 cents per bubble mailer, including shipping, by ordering from http://valuemailers.com , when ordering 100 mailers. That's a savings of $71 on 100 mailers!
Always, always shop around and find the best rates on printing, mailing, and the other basics of the trade.