It's one of the few guns that I have actually never seen make it on to the classifieds section of this board to this point. That doesn't mean it hasn't happened, I could have missed it, but that's not really the type of thing I'd tend to miss. Anyways, I'd say it's pretty rare, and I'm unsure as to whether 10 round mags exist for it (not that you couldn't have them made if you happened to acquire the gun). As far as price, you'd be at the mercy of the seller, but from the few HK45s that have made their way on here, I'd say you'd be looking somewhere between $1000 and $1500, probably about in the middle.
