If anyone is interested...
I visited one of the exotic wood stores in my area today and they have whole Briar burls in various sizes. All are unprocessed, still covered in bark and bits of dirt. Most are about the size of a cantelope 6-10" round, but not perfectly round. Roundish. Cost is about 6$/lb and most were in the 7-10lb range. I'm not looking to make money, just offering the source if anyone is interested. I'm travelling to the USA in about a week or two and could send from there if desired. Let me know.
I'll be hitting the other exotic wood store this saturday and I know they have Briar, but I believe the have more processed portions suitable for pipes rather than longer scales though. I'll keep and eye out if anyone is interested.
Matt