There aren't really any AMD options as cheap as the N100/95/97 mini-pc options. That said, there are some truly great options in the sub-$600 mini-pc segment. The Beelink SER8 with an 8845hs is pretty great to say the least. Bought one a few weeks ago for HTPC/Emulation usage running ChimeraOS, it's done a very good job. Though I might replace the BT/WiFi controller for something better supported. Only hung up once, but still annoying.

I wouldn't consider it "high performance" but it's definitely good performance and far better than any Intel mini-pc options I've looked into.