i recently aquired some cedar stump "driftwood" from Welcome to Texas Diftwood.com
he is actually local (lives about 5 min from me) in college station, texas.
he is selling driftwood that comes from dead cedar stumps on his land
his workers cut up the stumps, and then he treats them in a large rolling (think cement mixer) bin with stones and water to strip the bark and rinse the wood
he has sold his wood to LFS before, but his primary customers are taxidermists
i have been soaking 2 large pieces of wood in my 50 gallon tank without too much trouble, it is dead wood, and doesn't seem to be rotting, but because of its nature and the "non-bog" wood status, it does leech tannins and will do so for some time similar to peat, but it isn't something that is terribly harmful to my fish , you can also soak this wood seperately outside of your tank to remove tannins, i boiled some smaller pieces as well
keep in mind, some of the driftwood you'll see in a LFS probably comes from local sources like his, we chatted and he said the LFS used to just soak it to sink the driftwood or bolt it to a piece of slate
his prices are good too