April/May and November/December, give or take a couple of weeks. The sale lasts for one week, and requires a coupon code, but they are all over the internet that week as their are dozens of different codes floating around. DVDTALK is usually one. The one catch is that you should almost expect your order to get delayed if you order during the sale. If it doesn't, you got lucky. They get SLAMMED with orders that week. Some people out there drop literally thousands of dollars during the sale, and it's not unusual to have items be backordered for a couple of weeks while they restock. Still worth it though, to save another 20% off prices that are already really good.