You may need getting a chain saw and have a look around, you would be surprised what you will find.
Your local dump is possibly a "gold mine" and talking to the local arborist's/tree guys does always get you some good stuff.
If all this fails and you can't find locally what you want, you're welcome to look on my eBay store however, keep in mind that I'm is Australia...!
Good luck,
Cheers
George