Used: Browning Buckmark, Ruger MkI or II, Iver Johnson Trailsman (Colt Woodsman copy), or any number of the European brands like Star F-series, Beretta 70, etc., that've been imported in large numbers over the years. A browse through the aisles of about any gun show should provide lots of affordable options.
The Beretta 'Neos' is about the least expensive NIB option I can think of at the moment. I picked one up with the short barrel, SS, for $239 OTD. Included two mags, nice case, ambi safety, and integral optics mount. There are a number of grip and front sight options available from the factory and some of the larger retailers now, and more in the works. There's even a carbine conversion. All are easily installed by the user with no fitting required.
Ours has been perfectly reliable and is slicking up nicely with use. Good basic plinker/trail/camp gun for the money, IMO.