From their announcment:
Save 20% on hundreds of titles!
December 15, 1000 Hours EST to December 19, 1000 Hours EST
Get in on the Winter Offensive! Shop for five days and get 20% off the regularly priced products from 95 of our publishers! Hundreds of great downloads on sale, but only for a limited time! Prepare to move out, and get in on the Winter Offensive!
And Happy Holidays From Wargame Vault!