I use oak, as have a load of floor boards from a flooded house, like them cos you dont have to use extra weight. If I was looking I would phone some flooring companys and ask for some end cuts, they just burn or throw them...
I use wheel balance lead on the inside of my decoys if they need to be balanced, those to I will get from the garage that does work on my car, they had heaps of them in differnt weights even comes with sticky side although I super glue mine on when I have the balance right..why pay for stuff if you can get it for free...
Paul aka Scotty