Right now Introversion is offering their own Kickstarter style rewards program for early pledges of cash, with varying reward tiers available. $30 gets you the alpha build to play right now.
If you were to go as high as $50 then you'll be criminally immortalised by having your own name and rap sheet attached to a convict.
Introversion offers a tongue-in-cheek trailer to explain. Check out thefor a full rundown on the early adoption rewards for those looking to run their own Prison in Dungeon Keeper/Theme Hospital/Dwarf Fortress style. We're promised game breaking bugs as Introversion keep the dev chain gang working.