I bought my 7mm TCU Barrel used and got a set of dies with it. Maybe you should wait til you buy the barrel, the person selling it may have a set of dies to go with it they are willing to part with for a few more bucks. I also got a few hundred pieces of formed 7mm TCU brass. That was another story, it had been neck turned and wouldn't hold a bullet, so watch out for that if someone throws in brass.
If you are buying a new barrel, nevermind.
Or, try Ebay, Gunbroker, etc. for dies, I have gotten a good deal there on occasion on odd dies.
I personally prefer RCBS, with Redding a close second. But for some odd calibers, I do have Hornady, Lyman, CH4D (they are all about #3 to me), and LEE dies because I just couldn't justify the cost of the better brand (in my opinion) for the limited amount I was going to shoot that caliber.
I will say the tapered expander on the Hornady 9.3x57 forms them great from 8x57 brass, I really like how Hornady did that.
Jason