Just ordered a Race Deck floor for my winter storage garage. I ordered direct through Race Deck and got a good deal because I'm a Garage Journal forum member. I also priced out the floor at AutoGeek and it was only slightly more expensive. Right now they're running a 15% off everything promotion if you enter the code SEMA4 at checkout. Sale ends in 2 days.

http://www.autogeek.net/racedeck-diamond-flooring.html

Here's the layout I decided to go with: