[clusmore]

I think you're missing the point. The use case where I would want to see the shipping cost up-front is that I'm buying a single item and I don't care who I buy it from -- I'm browsing across a number of stores and will pick the one that gives me the best price (with the least hassle). In this case (purchasing a single item), there is never going to be a B -- I just want to know as easily as possible what it will cost to buy and ship this single product.

If I need to register in order to find that out, forget it. I'm browsing across multiple stores that I've possibly never visited before and never will again, I'm not going to register to all of them. If I need to add to the cart, you're pushing it. If somebody else can tell me upfront, they're ahead and more likely to win my business.

Based on only my own usage, if I haven't registered to a site I'm obviously not a regular buyer there and am most likely there to just buy a single item.