You may want to call them first then you aren't driving all around. I would start with tell them that you are looking for pallets that are no longer needed to build a coop, ask them if they have any pallets that they aren't needing anymore, and if they would be willing to let you pick them up. You may want to look into how much a new one costs in case they want to charge you, most will give them away. Another place is to look is your local power company, sometimes they put a pile of unneeded items: electrical poles, pallets, wire spools, etc. I always grab the wire spools; you may find these handy for something also.