Questions on HP Prime and its features

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Thanks for the replies. I now know I belong in the 48/49/50 family, given my usage. I've found some used ones on the usual sites. I'm shocked at the prices for those listed as new, if they're even truly new. (Amazon has been cited recently for deceptive descriptions.) There's a 49g+ for $230 and a 50g for $500. Neither actually says "new," but that's implied, because the others listed near them are described as used. Assuming that they're actually new, is this because they're not made anymore and sellers want to see what the market will bear?