I was able to get some Billboard tarps in Tampa. I could only fit 6 of them in the Trunk of my car. They were free. I got them from ClearChannel. They were only concerned with that I didn't sell them on Ebay and at Flea markets. As has they have been discussed a number of times on this site I won't go into detail. They will make great DWC and Fish tank liners. VERY heavy and free. You couldn't ask for more.
Go get them folks. RRR Remember - Reduce Recycle Reuse