My guess is anywhere from 100-500 gold...in other words I have no idea really.
All I know is that there will be a LOT of them out there for many many months to come. I myself have about 450 and will probably get 2 or 300 more. Say there are 100,000 out there...how high can the price really go?
I havent seen any posts about how long the holiday festivities last...if its thru New Years, there will SOOO many candy canes I'm not sure they will ever have the value many farmers are hoping for.
A

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Should of tested it before posting... the only use I see them for is for when Chapter 2 comes out and theres some uber hard area where its so far away from a outpost that its a chore to start again, but your stuck with 60%DP. Other than that no point.