You really have no choices when you set the price at $120. I'm not saying that you may not not find an analog synth for that price, but you won't be able to pick and choose. Simply watch the classifieds and auctions until something comes up in that price range. But be aware that most analog synths are old and you need to be careful of buying anything old that may need work because that would be very expensive.

I bought a Roland JX8P synth and programmer years ago for $100 just because the owner wanted to make space in his studio and wanted it to go, so you can be lucky. But chances are you'll have problems finding either a synth module or keyboard in that price range.

Your best option would be to get a soft synth that will do what you want. Yeah it may not be true analog but it could give you the sounds you are after which is the most important thing after all. And it would fall into your price range.