Prices in England are a bit daunting-- a pound is worth about $1.50 but it seems like things cost the same number of pounds as they do dollars in the US. I stopped worrying, however, when I went to Tesco. I don't know much about this store (besides that it's the biggest retailer in the UK), but it certainly is cheap.
A 500 gram box of cereal cost 31p. Two toothbrushes were 18p and toothpaste was 25p. I splurged on a bar of 'Coal Tar' soap (80p). I thought that it was just a brand name at first, but this soap is specifically designed to make you smell like coal tar. It's a great new world.