To be honest your not going to find much at your budget. I would say save a bit more up and look at the $500 price range as a target for starting to find a good sounding phono stage. That said I can recommend the ifi Iphono 2 ( or 1) as a great entry level stage new just under $500. beyond that your into used stuff and that's hit and miss at this price point. I just took a look at Needle doctors web sight and they have a whole assortment of inexpensive phono stages have a look.
Lehmann black cube
these above get desent reviews for the money and closer to your budget.