The only thing that you need to do sometimes, is keep track of whether certain outfits are doing a X-Mas tree routine on shipping. If they're going by weight alone or hammering you for shipping "by the item", can make a large difference. It's easy to quote a low price on a commodity, if your making back your cost by hiding it in a creative shipping cost structure. I'm not saying they're doing it, just that it's something to check out.