https://www.amazon.com/ASUS-STRIX-Radeon-Graphics-STRIX-RX470-O4G-GAMING/dp/B01JS2UFDM/ref=sr_1_2?s=electronics&ie=UTF8&qid=1490768443&sr=1-2&keywords=rx+470
This is $159 so just over your budget by $9 but if you can grab one of those they are excellent budget GPUs. Capable of 1080p Medium/High in most games at a solid framerate and the best you can get within your budget unless someone can spot a good deal on a GTX 1060 6GB or RX 480. Hope this helps