Ok, I may be a little slow on this as I havent been to Tesco for ages until this morning, so maybe you know already! but I thought I'd mention they have a baby fair on at the mo and are selling their cheap buggies for £12.
Not as good a bargain as the holiday buggy I bought there a couple of years back for a fiver, but actually a better buggy (although its a bit bigger) because it has swivel front wheels and a higher handle.