Contact the BBB.org and file a complaint. (He has an "F" rating already! WORST there is and you should have seen that before sending him your money)
Go to RipOffReport.com and tell your story.
Go to every hunting forum you can find on the internet and repeat this post.
Go to HIS local craigslist.org and the closest three or four around him and repeat this post every week.
If you paid via a credit card, call your credit card company.. They will yank the money from his account so fast it will spin like a quarter on a table.. I'm not sure if this will work in your situation because of the 10 month time but you can try.. They may not start the proverbial clock until delivery.. or perhaps time of purchase.