cheapest place.. go to a busy range and if you see folks heading to the brass bin to pitch their brass.. (we sweep up between courses of fire at the local ranges.. so every 15 minutes or so) ask if you can have their brass. You'll probably get a lot of 9mm, 40, 45, 308, 30-06, and 223 very cheap.. the cost of going to the range. I usually leave with more brass in my calibers than I arrived with.