I convinced my grandfather to give me $30 to buy one at a garage sale while i was house sitting with him (he had emphysema and was 82 at the time) back in the early 90s. he lived as an adult through the depression, so it was a point of contention between him, me, and my mom. It only came with 1 cartridge iirc, and a brochure showing all the accoutrements you could add to it, speech module, joystick, and i forget what else.

turning it on and getting a BASIC prompt was real cool. never could save anything, though. I traded it in 1999 or so for an Apple IIc with monitor, with which i could save data.

coincidentally, i just mentioned owning a ti-99/4a to a friend yesterday, we were comparing notes about the first computers we actually owned, and that was it, for me. We had an atari (the wood paneled console one, carts, with keyboard built in, BASIC interpreter on ROM) in '87ish i guess, but i only had it for a couple of weeks before i accidentally blew it up with a cable trying to save something to a tape recorder. the tape recorder had a cable in the back that had a 1/8" TS plug, which apparently was a radio shack "universal power supply" and i guess i put 9VDC into the speaker port.