My comment from a month ago:
For bases, Birchwood Casey. Zoro.com will send you a 20% off coupon after placing your first order. Could take up to 2 months for them to arrive, but the price is half that of amazon.
These seem to be the best hangers.
They don't have a great selection, but this is a pretty good price for basic targets. - $107 shipped using a coupon for two 12 x 20 targets.