I just changed my plan because I wasn't using the interweb enough to justify the $30 a month. I was wondering if there is much of a market for these phones since I can't use it without the data plan. Mine is almost perfect and I have the box and all the support stuff; CDs etc.
The 8330 is a classic and is still a fairly popular device. You could try posting it in the CrackBerry Marketplace. Read the terms first ... you will need a certain number of posts and must include photos. Another option is eBay. Good luck.