Depends on your area and what YOU consider to be in good shape. My buddy and I just bought one on auction last Sat for $450. It had a million "miles" on it so to speak but was working and not water damaged. (which is a major hurdle IMO to restoration). You won't just
find a 7-9 out of 10 (10 being a primo cab) in my area for under $1000 unless you're damn lucky. Where you are at, there may be more to choose from. I live in an arcade desert so to speak.
Best thing to do if you are really interested in getting into the hobby of collecting arcade cabs is start meeting people and get your name out there. I will bet there is someone here or over on KLOV that lives in your area that has some connections... The best deals to be found are by a friend of a friend if you know what I mean.
If you just want to build a mame machine for now to see how you like it then you are at the right place! These mothers on this forum know their stuff. There are some amazing things done here!
Oh, and you are welcome!

You will not believe how fun this can be!