rxmd
May contain traces of nut
If "under $50" is the criterion, hunting for a Yashica might take a while. The most serious contender to the Lubitel is definitely the Flexaret. The old Flexarets have a Triotar-type lens (Mirar 80/4.5) that has a beautiful, if not super-sharp rendering; on eBay Germany they regularly sell between 25 and 50 EUR. I have a friend who used to use an oldish Flexaret almost exclusively for 6x6 (well, later he also used a Kiev 88 with a 65/3.5 lens) and who produces some outstanding images with it. The camera is quirky, but it's definitely worth it.