At the risk of being a TB cliche by suggesting something other than what the OP is asking for, get an inexpensive DAW, not a tape deck. (DAW = Digital Audio Workstation aka. A recording program on your computer)
Recording to tape decks (like 4-tracks on cassette) was obsolete by the year 2000. It's been another quarter century since they went obsolete. You'll have a hard time finding one that works for cheap. There's no guarantee it'll continue working. You won't be able to fix it. Cassettes are hard to come by and a terrible medium for recording. The bass will sound like plucking a rubber band. You'll need a separate piece of hardware to bounce your multirack cassettes down to standard stereo two-sided cassettes. And then nobody has cassette decks anymore to listen to what you record.
A DAW will sound better and bounce directly to WAV or MP3. An inexpensive interface and an inexpensive DAW will probably cost less than a cassette tape multitrack and will be infinitely more useful, better sounding, and versatile.
Garage Band is a free DAW if you have a Mac, iPad or iPhone. If you already own an Apple device, don't want to learn a ton of audio engineering, and just want to record some things with you and a few other instruments, Garage Band is hard to beat.
Reaper and
Ardour are extremely full featured, so there is a bit of a learning curve. But they're extremely inexpensive and work on any computer type. And there are tons of tutorials online to get you started.
Audacity is free too, and it's a great recording and audio processing tool, it's a little clunky for recording and editing music into songs. (It might have improved since i last used it.)
Then all you need is a halfway decent audio interface. There's a million and 4 TalkBass threads on picking one of those, and even more YouTube videos and articles online on picking one in a price point so i'll leave that for you.