Aside from finding them used, which is very very rare and you'll still spend 100-120$ for, they can be bought new for 199.99 (if you can find a place that has them in stock... which i doubt).
Not worth it.
If you love the PMR, then wait and find a PMR with a UL frame fitted (for around 150-200$), and then sell your current one to recoup your losses.
If it was me, i'd just save up and buy a better gun and make the PMR your backup.
The only upgrades worth purchasing for a PMR is a metal back cap, Dye UL trigger and a new barrel (find one used for cheap). After that, its all about saving for a newer/better gun.
Last edited by peacob : 12-02-2012 at 10:59 PM.