I was just at my local Tractor Supply and the 800lb flat carts were on clearance for less than 1/2 price at $23.99. They retail for $59.99. I don't see it listed online for that price but you might check your local store. I've been searching CL for a while to make life easier moving heavy stuff around. Heck at that price I picked up 2 of them.
http://www.tractorsupply.com/tsc/product/groundwork-800-lb-flat-bed-mesh-garden-cart