Used ones go for about $25 on Ebay https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=ti-83+plus&_sacat=0 https://www.ebay.com/sch/i.htm

Used ones go for about $25 on Ebay https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=ti-83+plus&_sacat=0 https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m... Same on Amazon: https://www.amazon.com/s?k=ti-83+plus&crid=1OPODU9X5ZHVY&sprefix=ti-83+pl%2Caps%2C243&ref=nb_sb_noss_2 https://www.amazon.com/s?k=ti-83+plus&crid=1OPODU9X5ZHVY&spr... In-person used stores are likely cheaper still (Salvation Army, etc). The thing about producing a long-lived device that a person only uses for a decade, without ever updating the product... is that the used market very quickly saturates.