Two right now, though there have been about four altogether. All have been price motivated.
I'm not really into fighting games, but I bought a Soul Calibur, because it was totally working in a clean 25" JAMMA cab.
I got a Neo Mini very cheap as part of small group of games I got. My buddy originally wanted it for his apartment, but his skank put the kabosh on that idea. I love the way it looked and intended to restore it, but it just kept getting bumped by other projects. I'm giving it away, new owner is coming for it tonight.
I had a near perfect Virtua Fighter given to me, gave it away, and now have it offered to come back free again, but non-working. My wife liked it because the white and chrome stuck out amongst all the other games.
I recently got a non-working Stern Moon War from another KLOV'r for a great price. I didn't know what the game was, but wanted a Stern cab to be a "do-it-all" to swap in various vertical Stern games... It ended up being so pristine and unusual that I got it working and kept as-is even though the gameplay doesn't totally grab me.