So are you selling or buying one?
It's been hard to sell guns lately, people holding real tight to their cash.
I don't usually see P45 for sale, but I run into quite a lot of P40. In lightly used condition, I think you can get a P45 for 400-500, most set their prices at 475 though.
As for the laser, it depends on how badly a person wants it. I never care about a laser, so I treat it as a 50 bucks accessory if used regardless of how much it cost to begin with.
Fair price, 500-600.