I've not had much luck with Etsy yet, only a few page views and I haven't tried any pens on eBay yet. Actually sold this on on a pipe-smoker's forum that I frequent (it being a pipe-themed pen due to the Briar wood).
Wood came from Vermont Freehand--they sell pen-sized Algerian Briar blanks on eBay from time to time. Their main business is tobacco pipe-making supplies.