How big is your tank?
My BN are sucking the wood all day and night. As I mentioned, I got the wood from drsfosterandsmith online supply. They call it driftwood, but it lowers the Ph, releases tannins that the fish like, doesn't float, all the stuff that good aquarium wood is suppose to do. They had the African on sale for 2,99 for 5". Don't know if it still is on sale. The thing with online you usually have to buy about $30 of stuff to make the shipping cost effective. On the other hand everything is cheaper.
The other thing would be to google bog wood and driftwood to see what you get.