I use wood shavings as well. I have some that's 4 years old. Boy is that great stuff. I have a couple of area landscapers who come and get it by the truck loads. Also many local gardeners who come and get a few bags. I just give it away, as I have too much.
Paul, bring a semi trailor, and I'll fill it for you! Better yet, come and buy a horse or two, and you'll have your own supply!