I think it was two years ago I bought my TC Renegade from gunbroker, I paid $275 for it, and it was in very good condition. I don't know the shops out your way, guessing Princeton or Cambridge area. You aren't far from the NMLRA sponsored range in Harris, MN. I've never been to their muzzleloader match, but I may go this year. I don't know if anyone tries to sell there or not.
That said, the best deals for muzzleloaders are often found online. There is no FFL needed, you can ship them right to your door. TC's are found quite often for good deals. I think TC side locks and flintlocks are an incredible value. They are a very well put together, and solid gun. You are not far from Track of the Wolf, so powder shouldn't be that hard to get. Fair warning, they up charge you for convenience. I once ordered powder, listed on their website something like $20 a pound. When I showed up to pick up my order, they were charging me about $27 a pound. You can pay hazmat and have it shipped to you for less if you buy enough at a time.
One last thing, there were two generations of the TC flintlocks. Take it from someone who owned one with an early lock, and do yourself a favor, get the later style lock. Pictures can be seen here, the post with Zonie.
Early TC locks bad? I was told this.