A non-working Pong clone is not worth anywhere NEAR $250. Working ones go for under $200. Get the pinball machine. I have owned a few pong clones. They usually look great sitting in your living room (they are usually in this pornographically mint condition due to the fact that the early 70s cabinets were built a lot better than later cabinets and they usually only got a few years worth of use), but you just aren't going to play it.
You see the thing about Pong clones is that they all require at least 2 players, and finding two people who want to play Pong, at the SAME TIME is going to happen so seldomly that you will be lucky to get in 10 games a year on the thing.
I sold a minty working 4-player pong clone to one of the posters here a while back, and I don't even think I charged him $250. It was $100 or $200, I honestly can't remember anymore.