We are doing a major renovation, but have some extra building materials over what we need (specifically a large roll of geo-textile and a whole load of Golpla plastic honeycombs for a driveway). Though they are in perfect condition, we are not able to return to the supplier (mostly because they are out of their packaging). I was thinking of putting them on Ebay, but then wondered if there is a specific auction site/forum for builders which might be more suitable. Any ideas?