I buy the dies from Shoppers Rule, Sewforless, Bayside Quilting, Amazon, and any other place that has a good sale on them. I pay anywhere from $20 to $80 per die. I like the dies to try. Limited editions of dies that may not be made for distribution. The Dies to Try change from time to time.
http://www.accuquilt.com/go-shop/die-to-try.html