I ordered directly from Lee and sent them, I think 4 pieces of fired brass. This was for a 6-284 and it didn't take as long as they said it would for delivery. I'm not sure if they built the die around the brass or just made sure it would work but it's pretty cheap for a "custom" die.
For the price of the 2 die set you can throw away the seating die if you don't like it. The collet die is so easy to use it is worth what ever they want to charge to me and my Lee seating die works fine as well.