Dr. Blackmon's equipment is the cheapest to get started with, but there's a minimum 6+ month wait. You'd be into the gear about $750.
BT Sniper (castboolits forum) can get you started for about $875, with a 2-6 month wait (depending on what he has available and what has to be machined, when the order is placed).
Beyond those two options, the cost climbs quickly to $1,200+ for "basic" Corbin dies (RCE or Corbins), or $2,000+ for EDM cut dies (such as Detsch).
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."