I bought two sets of Alpinestars SMX+, one for $75 and one for $125 both in basically new condition. I just picked up a set of Sidi ST boots for $200, and a free set of Alpinestars SMX-5 waterproof boots.
Deals are out there, you just have to find them. I've picked up four pairs of used boots in the last couple years, all for less than half of retail. There isn't much gear for sale here, but check your local forums and regional racing forums. I also keep an eye on the wera classifieds. I've found stuff by searching for: "(whatever you are looking for) for sale, forum". You'll have to dig into the links, and through old threads to find the good stuff, but it is out there.