I think ARC has an ARC 22 for sale. If that is out of budget go for a Supercat 20, but expect to put some work in as those boats are older...

I just modernized an old SC20 and money wise you probably end up better with an ARC 22 and still have a light boat you can still sail singlehanded in light wind or up to 4 in a breeze (although the designer will tell you, it's not build for that) it works pretty fine...