Start looking at the for sale adds on subguns and sturm for RR conversions or plain old RR guns. The market has taken a hit. I have seen RR's at firesale prices below 6k. With that in mind bolts would be 4.5k and add on for the host. All together about 5.2+/- a few hundred. Bolts are not as desireable as RR factory guns. Conversions are also not as desireable as RR factory guns (there are exceptions- Israeli guns that were properly converted)
Your mileage may vary and best of luck