Locally here, the 'boys' are starting up Cowboy Action Shooting. They're having a lot of fun, but that sport can be expensive.

Let's see:

2 single action revolvers
Period lever of pump action rifle
SXS hammer shotgun (hammers not mandatory)

That's bare minimum.

plus, for those inclined:

2 - cap and ball revolvers
Sharps or rolling block for long range side bet challenges
Lever gun or two or three for side bets,
such as:

Henry, Model 66, Model 73, Model 76, Model 86

It adds up when you go overboard, considering a good (Uberti) 1876 is almost $2,000.00. The others only a little less and the 86 is more, if you can find one.