Because of the money amount you state and the requirements you want, check Cabela's Black Powder rifles. I understand they have a Winchester Apex in camo with a stainless barrel for $229.00. This would meet your requirements and you could put a scope on it at a later time. If you try and get into an Omega with camo, you're going to go well into the $300+ range I suspect. The Apex is a Omega copy cat kind of, so it should be what your looking for.

Also from some of the posters on the board, the Apex is said to be a good shooter. I personally have no experience with it.