Ebay or Aliexpress are good options with buyer's protection. I bought quite a few OrangePis in my time, although that was at a time when the Orange Pi Zero was

Ebay or Aliexpress are good options with buyer's protection. I bought quite a few OrangePis in my time, although that was at a time when the Orange Pi Zero was 9 EUR a piece. At current prices, I don't see the point. The OPis themselves were quite decent devices, Raspbian worked very well on them.