Hi AR
I bought a secondhand one for about £150 in .22 and gave it to my brother as he had been talking about one for years and he loves it.
I would buy a used one as they are built like tanks and rarely come across a really worn out one. There's many that have been bought and left in a cupboard.
I wouldn't worry if it's .22 or .177 as it doesn't make much difference at pistol distances for plinking. Most seems to shoot around 5ft-lbs so either calibre will do what you want.
I found a stock for my brothers, the dovetail is 13mm so I got the correct size mounts, a walther red dot, custom carbine case. The only thing I replaced was a worn breech seal in a tougher urethane material.