ABH20: EVE Online: Crucible is 66% off until the 30th of March.
And there are some people getting 75% off coupon right now for Eve Online so it can be very cheap if you can put your hand on one of those coupons.
The Steam version tends to fall far behind on updates though, so it's best to just buy it on Steam for the CD-key which you'll need to register through the CCP website anyway when you make an account with them. Then download the game from CCP to get the most up-to-date version of the game.
It doesn't matter since the client updates itself after you start the game anyway.