Average player with a bit of wear, maybe $500
Nice condition, maybe $700-800ish
Even really nice ones top out around a grand.

It's a fun game, but nothing special, and there were like 15k made

I've seen multiple presentable examples sit at around $600 needing only minor work. That's my main reference point

$500 for heavy wear, $800 for nice one.

Make sure the backglass is good, because a new one is worth more than the entire game.

I purchased one in really good shape for $800 about 2 years ago. If the backless is really beat, I have one in OK shape for sale.

I bought one with pretty heavy wear 2 years ago for $250 and it sat on Craigs List for a while at that price before I eventually sold it.