Last Year's
TFSource Stocking stuffer campaign gave us Santa Commander (Grimlock), a blue, G2 color scheme with a holiday cap.
Too late for the holiday season, but plenty early for the next, TFSource introduces smallest Reindeer Commander (G2 Green Grimlock repaint with removable antlers and red nose), and Bombardier Elf (G1 Red Swoop repaint with festive cap).
You can see the offer at TFSource
here. They offer this to customers who have ordered $75 or more recently, or who are regular past customers.
The set cost is $35.95 and also includes the chance to get 1 of 10, random silver colored 'lucky draw' versions as well.
Details can be found at the link above. This set is scheduled to ship in late March.