I'm looking for a vintage 80s boom box with a tape player and radio

I would like to find a second-hand store or flea market in Chiang Mai. I'm looking for a vintage 80s boom box in decent condition, with a working tape player and radio.

I found the huge antique shop near Nong Hoi Market, but all of their boom boxes were broken and in really bad condition. If I can't find anything else, I might just get one of those and try to restore it. (That's a really interesting shop, by the way. I could spend hours in there)

I saw another post on thaivisa where someone said there were some shops near Tha Phae Gate, but I drove around and couldn't find anything. I also went to the audio shops in KSK. They didn't have any boom boxes, but they do have a good collection of cassettes and records.

I would be grateful if you could point me to some other second hand stores. And please let me know if you have one that you could sell me. (I'm hoping to find one for around 700 baht.)

(P.S. This is for a hobby project. I thought it would be fun to convert an old boom box into a Spotify and internet radio player, similar to this guy's project.)

 Thanks!