I managed to get a MISB TFCC Sideburn for $70 last year on eBay; after much humming and harring I almost caved in and clicked on "Buy It Now" for a ridiculous $110. Not risking that again this year.
Having secured the price this year, the next worry is the quality of these exclusives. Had a rough run of luck collecting MISB TFCC exclusives last year - worst was a MISB Sharkticon who's backpack does not fold down properly.