You can shop around and find the guns and kits at a bargain, cheaper than dirt had a good sale on the kits a while back, $350 or so but sold out quickly.
I will take a look and see what I can find.
Last time I looked Midway USA had the lowest price but they are inline with everyone else now.
Bass distributing has the flint version for; Your Price: $482.96. These things have really gone up since looked last. Gunbroker has a bunch of them but you have to be careful on used, someone's listed shiny barrel could be pitted and roached in my evaluation. They come up pretty often on the M/L boards classified, usually for around $350 or $400.