From what I can see, the3D arena clothing showing up on sale, but all of the characters are showing at full price. the "make a comment" section on the 3D-Areana front page seems to be disabled.

I'm not seeing any sales prices showing on TwiztedMetal either. There is, however, a sale running for DM's store and new release that hasn't been posted on the DEALS page. I often wonder how many sales I miss due to this sort of thing, as it seems to happen fairly often.