I was thinking of Inexpensive as being in the $150.00 to $350.00 range. A used Baikal and the BRNO's fit this range.

I also read the initial poster as desiring a double slug gun to be left in 12 bore, not re-barreled for a rifle ctg. and be left for the use of round ball or slugs, with irons dovetailed into the rib.