An American company called Gilson has listed up a range of licensed Transformers snowboards and skis, for adults and kids.
The website says that they can ship outside America, but you'd need to contact them for details (the free shipping is likely to only be within America).

The Adult snowboards are US$595 - Optimus, Megatron, Grimlock, Soundwave.
The Kids snowboard is US$325 - Bumblebee.
The Adult skis are US$775 - Optimus, Megatron, Grimlock, Soundwave.