If you're looking to round out your collection with a new store pet, now is probably the best time. Half off is a pretty damn good deal, and it's a rare occasion where almost ALL pets go on sale. Happy holidays to us? XD
Another special going on is from Wowtcgloot.com. They're holding a raffle that includes some rare/common TCG pet giveaways and a limited time sale that also includes TCG pet giveaways.
More information and details: Holiday Raffle (contest ends January 1, 2015) and Christmas Special (available while supplies last).
There are some neat TCG pets up for grabs.
Ethereal Soul-TraderThese pets aren't quite as rare as they once were, with all of the "dupes" and stuff going on. Still, if you can afford it and are interested, don't pass up a chance at winning one (or more?!) of these pets. :)
Eye of the Legion
Spectral Tiger Cub
Murkablo (BlizzCon 2011 pet)