talked about a UK/US supermarket comparison site called http://www.mysupermarket.co.uk/ (UK version) that enables you to paralelly compare the total sum of your shopping with each individual supermarket taking part in the list and puts the cheapest of the supermarkets on top as soon as the sum of your shopping basket changes with a cheaper new product.
Now I stumbled over a similar German site called http://www.supermarktcheck.de/ - it does not compare whole baskets, as far as I found out it only compares single products so it takes a bit more work to figure out the basket for each single. Another feature of the site is that you can either search for 1st option: How much?, 2nd for: Buy where?, 3rd: How many calories?, 4th quality check? and finally 5th: How much will I save buying the shop's version of the product?
A neat site which surely could highly progress by offering a similar "basket comparison" option as the UK and US comparison sites.