Have you looked for letters on ebay? I've seen some unfinished ones much cheaper. I got Avery & Reina's there. Only thing you'd have to worry about is waiting on the letters before you could paint them for people. Unless you keep a few of each letter in stock.

Anyway, here is one auction for 8" letters for $2.25 each ($6 shipping for up to 12 letters). http://cgi.ebay.com/8-Unfinished-Woo...QQcmdZViewItem

I see a bunch more auctions too.

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