There's usually some sort of promotional on-line shipping discount at this time of year, and 2008 is no different, if not better.
If you spend over whatever amount, you get free ground shipping to wherever, within the continental United States of course. But if free shipping is what it takes to get you spending online dollars, stores are willing to shell out the whole extra $20 to get you your goods.
Need to ship internationally? We'd suggest Shopbop. If you spend more than $250 they'll ship your order anywhere in the world without the slightest extra charge.
So go, stimulate the economy.