Damn nice gun, that 617.
A Ruger Single Six is in the same price range as a Blackhawk, too. A quality .22LR revolver will cost about the same as its centerfire equivalent.
My Marlin .22 lever gun cost me about 20%
more than the equivalent .30-30. Then I bought
another one... Nothing beats being able to shoot hundreds of rounds, and pass the gun around to other people, without giving a thought to the cost or the effort of reloading, burning up the barrel, or recoil!
The reason you can pick up a 10/22 or Mark III cheaper than centerfire guns is that the low pressure of .22LR will allow a very simple semiauto blowback action that has few moving parts, and you can make parts like a 10/22 receiver or a Henry receiver from alloys that are much cheaper to work with than steel.
If you want a steel gun that's made like a centerfire (S&W 617, Ruger Single Six, Marlin 39, etc.), a .22 isn't going to be cheap just because the caliber is smaller.
Got 7 already? Why not get a .22LR, then? You probably have enough centerfire calibers to cover all the bases.