It costs about the same (or a bit more) to a 9mm
^This.
The only problem is that the only USED ones I've seen for sale were offered over the past couple of years at $200+ above the manufactuer's suggested retail price. I suspect it'll be a long time before you find many used ones, and darned few that cheap.
I've seen two used PMR's at the local pawn shop last year, a private seller was asking $900 for the first one, it didn't last a week. The second one was marked $700, it too was gone within the week. I'm gonna be honest here, I bought mine (for a lot less than $700) because I thought a pistol that held 30 in the mag was too cool to pass up. I do enjoy the pistol, it comes with pretty nice sights, trigger, and shoots well, but if it only had a 10 round capacity I'd probably look for something else, I'm just sayin.