Found 3rd Aug 2011
Or buy 2 and save 10%! This can be used as a normal grobag but also has a special zip for going around a car seat harness. These are £25+ at Amazon. Comes in various tog ratings and sizes. The price changes depending what options you select but £18.59 seems to be the highest it goes. Free delivery and 8% Quidco. There are other grobags on offer too.