> What is a SAM computer and where can I get one?

http://en.wikipedia.org/wiki/Sam460ex
http://www.sam4x0.com/sam460ex.html
http://www.acube-systems.biz/index.php?page=hardware&pid=5
http://www.acube-systems.biz/index.php?page=hardware&pid=756
https://acube-systemsbiz.serversicuro.it/shop/en/5-sam-motherboards

> would it be able to run Amiga games directly with the right software?

It may not be fast enough for all old Amiga games running in emulation via E-UAE, even with JIT.