I purchased my TI-83's and first TI-92 from a pawn shop. I know these places have a bad rep. for stolen goods, but many are legit. The 83's cast between $30 - %50 (used w/ & w/o manual.) The 92 cost about $90 w/o a manual. It sure beat the market cost of $200 at that time. Manual from TI cost under $16, I believe.
May I suggest you encourage those NOT interested in math to post their calculator & resale it 1 on 1. Its cheaper than buying a new one & you get more when selling one than if you use a pawn shop or user 'book' store. One more thing, technology is a moving target. Whatever you paid new for it then, it isn't worth it now. Don't expect more than half the value for relale, even if its pretty new.
(Oh, thanks for something non-political)
7ony
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I'll try to get us back on topic.
Here's the gist of my query. The community college I tutor at requires students to purchase a TI-83 (or higher--but the vast majority purchase the TI-83) for any class from college algebra on up. Most of these calculators wind up collecting dust in a drawer after the students finish their course(s). Semester after semester a new crop of TI-83's is purchased, and the old crop retired to the dusty drawer. The bookstore sells used books but not used TI-83's. I think it should sell used TI-83's. Any experience out there with used calculator resale?