Old Decking board (Edgiock B96)

I'm looking for a few short pieces of new or used Decking board. Doesn't have to be clean, as long as it's sound and not rotten. A few screw holes etc are no problem. I need pieces two or three feet long, but can take longer if you need rid of them. Not looking for a huge quantity, just enough to build a few steps to help a knight in armour to climb up onto his horse ( a mounting block). Can collect more or less any time.