The buy-it-now price is $339, not $399! $339 was below the price that the last two sold for on ebay- $345 and $355. So I set it just below. Anyone who wants to use buy-it-now can have the tuner for just below what the last two sold for. That sounds reasonable to me, and is certainly in the range of Fair Market Value.
I can see how you would mistake $339 for $399, so I changed the buy-it-now price to $340.

That should ease any confusion. If anyone gets pissed about the $1 jump, I'm prepared to negotiate!
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=801934800&rd=1
Cheers-
Mark.