ibuyer.net, pricegrabber.com <--- are there any similar sites that let you create a shopping cart for lowest shipping?

[Stealth1024]

I know pricegrabber.com gives you best overall price with shipping for an individual product, but I would like a site that let's me add components and then it does calculations grouping products with various resellers for the overall lowest price including shipping. Any ideas? ibuyer.net and many of these sites are very far behind also... I know mwave, buy.com and many other places are shipping Audigy II Platinum eX sound cards and AIW Radeon 9700 video cards but some of these sites fail to acknowledge these products even exist...