$200 limit for a gun just for fun?
I'd look out to see if I could still find a used (but beat up) S&W model 10 for that, but I think the days of $200 M10s (even those that look like they've been to hell and back) are gone.
A used Taurus 82. They are decent M10 copies (not exact copies). Try to get one that isn't so old (maybe look for the lock- yeah I know). The newer ones are more reliable (though most of these are good) and have MUCH better triggers.
A used Taurus 669, 66 or 65. The .357mag version is harder to find at that price than the 82 (harder to find at all used since the 82 is a mainstay of armed security companies, and few people part with their magnums it seems), but if you can find one...
A blackpowder replica revolver. The Uberti Remington 1858s and Colt 1860s are beautiful guns and aren't too terribly expensive. The black powder is a bit of work, but a lot of fun (I love the looks at the range when it belches that huge blast of fire and cloud of smoke).
A .22lr semi-auto rifle (I know you said hangun). They can be a lot of fun when you find the right one, they can be fired on most pistol ranges, and they are inexpensive to buy and to feed.
A .22lr pistol if you can find one at that price.