Also, I'd suggest a site called ShopItToMe. You tell it what your preferred brands are, and they send a daily email when they find that brand on sale somewhere. I have alerts set up for The North Face, Disney, Under Armour, and some other brands and I get an email almost every day letting me know something's on sale.
They won't let you know if there's a coupon code or cashback available on the store that has the brand on sale, though, so that requires a little extra sleuthing. But it's the best way I know of to get tipped off on sales on your favorite brands across multiple online stores!