Looks like a different category every day for a week. Some decent deals on waterblocks today!
(Looking at this link, it looks to maybe be tied to email)
https://www.ekwb.com/shop/black-friday-deals?dir=asc&order=price&p=1&utm_campaign=084c642811-EMAIL_CAMPAIGN_2016_11_22&utm_medium=email&utm_source=EKWB+Newsletter&utm_term=0_640d0a72ff-084c642811-107053301