Well the era is correct but with less than 9000 being made i would imagine they are quite expensive, but you could consider getting a Schofield .45.
Or another gun from the era is the Volcanic pistol
Its an odd little repeating pistol in either .41 cal or .31 cal.
The schofield is circa 1875 i believe and the volcanic pistol is around 1850's if i remember correctly. Both are around the time of your rifle and both have the "wild west" thing going on.
stealth edit: I didnt realise someone had already suggested the schofield... im leaving the picture though cause its purdy