Had one before I sold it around 2007, so we're up to at least 5.
It's a great game and a lot of fun to play, but IMHO it's one of the ones where rarity and desirability don't necessarily correlate. I'd probably price a decent (not perfect) one at less than a grand - probably in the $600-$800 range depending on condition.
That said, I'm fairly certain that there were more than a thousand made. Not going to guess at exact production numbers, but it was at least enough of a known quantity to get a port to the ColecoVision. Granted, it was probably part of a 3-game deal involving Mouse Trap and Venture, but I'm skeptical as to it having had a sub-2500 production run. That's not huge, but it's enough to at least make it somewhat familiar.