depends on how much room you have at your location, i had a friend who was looking for something to stack stuff on that would keep it off the ground............ well just so happened that the local walmart stacked their pallets behind the store and there never was anyone out there. so he rolled behind it and they had them nicely divided into two stacks......... one with the heavy duty polymer pallets and one with light plastic ones and the wood ones............... he went with the heavy polymer ones....... picked up a couple and took em home lol.
i would say you might be able to score a couple of them, or you could spend some real money and go buy some of those concrete paveing stones they sell at walmart or home depot............ depending upon the look you want for your wood pile. me personally i like free and if your gonna cover it with a tarp anyway..............