Welcome, we're glad you're here. You can also check craigslist.com in your area. Do a search on pen blanks, pen kits, wood turning, things like that and you'll probably come up with some reasonably priced stuff in your area.
My hubby and I scour the neighborhood and surrounding wooded area for deadwood and check it out to see if it looks like something that might work.
Yesterday, a large branch fell from a neighbors tree and took out the power lines. Once it was fixed, we took a walk down the street to see if they would allow us to cut some of the wood for our turning. They had no problem with that so we cut up a bunch. We'll probably go back tomorrow to get some more, before the tree guys come.
Along the way, not only did we get some nice pieces of Water Oak but made a couple of new friends in the process. I'm going to make a couple of pens for them to thank them for their generosity.
Enjoy the addiction.