Ready or Not is now available for purchase on Steam's early access !!
The price is CAD $45.99, USD $39.99, GBP £30.99, EU €35.99, NZD $49.99
Remember though this really is still the alpha version that they were forced to release early. The Team17 partnership with the developers seems to have folded and to keep generating money to finish the game they needed to go early access to get more Steam keys.