How is the TI-83 calculator still around? (repost)

Reposting a popular older post for Thanksgiving break

Texas Instruments TI-83 Plus Graphing Calculator

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CALCULATOR GRAPHING TI-83

Texas Instruments TI-84 PLUS CAS Graphing Calculator, Black (TI84PLUS)

Remember Your Old Graphing Calculator? It Still Costs a Fortune — Here's Why

TI-83 PLUS GRAPHING CALCULATOR - Electronics & Computers - Nixa, Missouri, Facebook Marketplace

Texas Instruments TI-83 Plus Graphing Calculator

TI-83 Plus Review - Math Class Calculator

Texas Instruments TI-84 Plus CE Graphing Calculator - kite+key, Rutgers Tech Store

Finally, An Upgrade For The TI-86

CALCULATOR-TI83PLUS-GRAPH Western Texas College Campus Store

Calculator Ti-83 Premium CE