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I did a google search for FFL transfer dealer and found Pinto's Guns in Renton. I know nothing about them except for what I read on their website.http://pintosguns.com/ffl-transfer/They say FFL transfer fee is $30. Seems like a possible place for you to have for rifle shipped and do the transfer.
Find a new FFL and complete the transaction, its a pain when a buyer backs out on you. Get in the yellow pages and just start calling FFLs and get the best price. Your personal score or rating is a big deal on gun auction sites and you don't need bad ratings. Communicate your problems to the seller and let him know you are looking for a new FFL, he might know someone he has dealt with in the past.