What are you looking to do with it? Here are a few that you might want to look at.
I just bought a traditions yukon on gunbroker for about one hundred dollars. It seems solid, with a drop breech action and fixed barrel and most have had good luck with them. I think midway had them for about $150.
CVA Wolf break action can be had for about $150, and again, most have had decent results.
CVA Buckhorn (open action sliding hammer) runs just over $125 at the local walmart.
I was looking at a CVA Kodiak Pro stainless steel drop breech in .45 for about $150 from sportsmans guide web site. Stainless would be nice, but .45 acessories are harder to come by.
The best quality might be the Knight wolverine .50 cal. Ye olde archery shoppe on the web had them in their clearance section for about $110 a few weeks ago.
Whatever you choose, be safe and have fun!