i just came across an excellent source of cedar driftwood this weekend
it turned out to be a local (5mi) source for me as well Welcome to Texas Diftwood.com
his 888-299-7718 number works best and he's available during the day
is a retired sheriff who owns a ranch with a large number of cedar stumps
his field workers will strip and chop the stumps and bring them in, he then rolls them in a water/stone tumbler to strip the bark and clean the wood
he then cuts a flat base on one side of them and then sells them
he markets mostly to taxidermists and crafts
but his wood is useable as aquarium driftwood!
i recently purchased several pieces and his prices are quite good ($3.50 for a 5-14inch piece!)
it only needs to be soaked or boiled (to remove tannins)
and if you want, you can sun bleach it to give it a grayer, less brown look
so far i've boiled 2 small pieces for about 10 hours and they've sunk and released a lot of tannins
also of note, it is long dead wood, and should not rot further!
he does have a minimum 25$ purchase for shipping orders, but if you can't fill a order that large (i bought 35$ worth of wood, 3 small, 2 medium, and 1 large, the small pieces would be sufficient centerpieces for probably 10-20gal range, the medium pieces won't even fit in something smaller than a 40+ and the large i'm having difficulty fitting in my 50, and is probably more appropriately sized for 75 or larger)
if you can't fill a minimum order you can try and pm me, and i can see about picking up small pieces and shipping them out for you if i have time