Not the most retro calculator out there, but the TI-86 is my favorite TI graphing calculator. I've still got all my games and stuff from high school (20+ years ago!) and I
Amazon.com : co2CREA Hard Case Compatible with Texas Instruments TI-84 Plus CE/TI-84 Plus/TI-Nspire CX II CAS/TI-Nspire CX II/TI-83 Plus/TI-89 Titanium/ TI-85 / TI-86 Color Graphing Calculator : Office Products
Texas Instruments TI-86 Graphing Calculator AS IS 33317192342 | eBay