My only advise would be to keep checking gunbroker.com. They will sometimes have a few bags of new stuff, usually in the $130 range. There is also some once fired on there, but it's just as expensive. Maybe buy some loaded ammo, pull the bullets, dump the powder and basically treat it like a fired round.
Pulling bullets is what I'll be doing once I run out of brass. Either that or neck down 300wsm Norma brass.