Look around for an M48, or an M48A if you don't mind stamped trigger guards. Don't get hung up on finding an all matching rifle. Since it has no collector value and is just a shooter if you get one with an arsenal replaced part it's no big deal.
The auction sites, like AA, will have a lot of them being sold. I don't know who has them for sale right now, but check the big dealers. You will definately pay less than $200.00, and probably around $150.00 for an excellant condition rifle.
Mitchell's Mausers are priced way too high from MM, and even CDNN sent the M48s they sold in the original Mitchell's Mausers box with the MM accessories. Just don't buy from Mitchell's.
Jim