There's a ton of Catalina 22's out there as it was/is the most popular production sailboat with something like 16,000 sold. That means anything you need to fix/find on this boat is out there.
There's an active owners group www.catalina22.org
with many local chapters and an active racing community, and Catalina still provides support and parts for the boats (even if you're not the original owner) Catalina Yachts
. You can also find parts and upgrades at Catalina Direct:
It goes without saying that these are fun, solid little boats. If you're looking at a swing keel boat look closely at the keel pivot bushing, the keel cable and the cable winch/cable tube as these are common wear areas. If you're looking at a wing keel boat make sure the trailer has a tongue extension.
A roller furler might be a good idea if you're sailing with a little guy as it will let you stay in the cockpit.
Best of luck, we really loved ours but eventually sold her when we moved up to a Catalina 30.