I helped a local elementary school build a playground shelter. Due to our ordering mistake, we received two (2) 6"x12"x24' fir beams instead of the required 6"x10"x28' fir beams. The lumber yard would not take the timbers back since they were a special order item. Where is the best place to advertise these two beams? They have been stored horizontally with treated lumber between them and the ground. Thanks for any help.