I got a .25 for $20 once. Not a raven, but equally cheap. Most expensive, that's a toss-up... DPMS Panter .308 was about $1,100 but I've also bought some nice handguns, like the Rohrbaugh and the Kimber, both were around $900.
I won a .45 in a raffle once, so I guess that would be the...