Not sure if any of the kids are sports enthusiasts, but REI has a 30% off any outlet item until the end of today. They have kids bikes, as well as some ski equipment, plus lots more (that is all that I looked at).

You have to shop the outlet section for the discount. No code needed, it automatically comes off when you place the item in your cart. If you don't want to pay for S&H, select the option to pick up at a store. They will email you when it is available for pick up.