I have a feeling I'm going to be going with pallets. I looked a pics of other people using them, and I noticed they put their pallets on bricks, to keep them off the ground (probably so the pallets don't start to rot either) and that was actually not a bad idea, and will get them to last longer. I checked craigslist, and I didn't see a single advertisement for plastic pallets anywhere, which is what I'd LOVE to use and just be done with it. PVC piping running through cinderblock could be another option. Just thought of that. Two pieces of PVC running through the holes of cinderblock spaced every foot or two.