There are a lot of repros out there. Most of the $3-500.00 guns are Indian imports. Places like Veteran Arms, Loyalist Arms, and Middlesex Village Trading, all stock the Indian guns. Dixon's has the standard Pedersoli line, as well as a bunch of consignment guns. There are also a couple of dozen custom gunmakers that offer production models as well as one offs that are historically accurate, but be advised that you can wait upwards of 3 years for these and pay anywhere from $1200-3000.00.
Are you looking for any specific type? I'm predominantly a smoothbore shooter and could recommend some different styles based on your needs/wants.