He generally groups the sale pages by cap design for these larger sales, and then you choose the color option for that cap from a drop down on that page. So pages for Keyng v3, Keythulu V2, Keythulu V3, Slo-Fi, Ork Trooper, and then all the available colors for each design, for 37 individual caps in total (based off the pictures).
Someone probably said it already, but also remember that you should be logged into the website ahead of time to cut down on the amount of time you have to be on it while it's getting slammed (which also helps the site).