My second computer was a TI 99/4a that I bought new at a J. C. Penny for about $100 in the fall of 1983.
I had put it in storage, but could not seem to find it until about three weeks ago. I was looking for a printer and found the TI instead. Quite excited, I brought it home. It turns out, I did not store two important cords with it; the video cord to hook it up to a display and the audio cord to save or load programs and data with a cassette player.
I quickly looked online for a source for these cables. I found a video cable at 8 bit Classics (https://www.8bitclassics.com/) for a reasonable price and ordered it. When it came in right away, I tried it out and the TI seems to work fine. I wanted to make sure the TI worked, before I ordered the audio cable.
Since that proved to be true, I looked on eBay and found one for right around $10 with shipping. Another $10 and a pack of c90 cassette tapes is on the way (also found on eBay).
So now the TI will have to wait another week or so, for the tapes and cable to come in.