EBAY is OKAY, but to think that EBAY will give you the best deal isn't particulary true. Maybe that there isnt that much of a market for TI calculators, but still, most of the are open boxes...
I got mine from ONLINE PRICE matching by staples and used a $20 off coupon for purchases over $75... haha THanks SPOOFEE for that coupon... so mine came just under $87 for TI-83 SE! Not bad...