I put laminate in some of my units and it's been a pretty good fit. I got the Nirvana Mahogany one from Lumber Liquidators. You just can't buy the light-weight 6 or 7mm stuff. The 12mm will hold up much better. I go whenever they have the odd lot sales. I picked up 700 sq ft 2 yrs ago for $0.49 per sq ft.
Now I'm just a pack rat when it comes to building supplies. If there is a great sale on laminate or tile I show up and if there is a deal, it ends up in my storage space until I need it.
PS, whatever you end up getting for flooring, make sure you keep some spare material on hand for repairs later on!