I think the 20% coupon at REI is about as good as it gets reliably. Backcountry also has a 20% coupon right now, and may have different selection.
I too caught the amazing deal late last fall, I think a couple days before thanksgiving. I got a Lynx II 40% off. That was the only time I have seen a deal that good. Amazon helped me find it, but Backcountry was the seller.
"If I'm not there, it means I'm dead...or late!" General W.R. Monger