Mike will have costing details, but a sim price really depends on the demand. Good luck finding a CRJ or 170 sim around right now. But I bet there are a whole bunch of 737-300/400 sims sitting unused. We used to interview guys in an old US Air 737-300 because our CRJ sim was in constant use, and nobody was using the 737s.
Honestly though, if you have the money to spend, and you already have some sort of rating, go out and do some upset training or get tailwheel certified. Sims aren't really all they are cracked up to be.