China!
You may be able to find a wholesale site that you trust to deliver but, personally my friends brother goes on business to China and they pass through Shenzhen (Shenzhen is the silicon valley of the east and it's wear 90% of electronics are assembled, though chips get made in Taiwan), they were able to acquire me an A10 APU for my old laptop back in the day for a very modest price as well (£35).
If you can luck out and a friend of friend you know goes over there, getting them to pick YXZ GPU shouldn't be a problem and I'm certain the price will be very good.