I just bought a sling from Earthkind Babies (after a recommendation from Misdee). The size I wanted was not in stock but they rang me and we decided on a different size. I had mentioned that I was a bit worried about it arriving on time cos we're off on holiday - and it took just 24 hours to get here.
It is so great to have such personal and prompt service that I want to shout about it and tell everyone how brilliant they are!
this is their site