This might be of interest? http://techcrunch.com/2011/06/13/why-groupon-is-poised-for-collapse/ John
I was just thinking this morning, I haven't seen a Groupon thread for a while.... I get emails from them every morning for £5 hair perms and the like, I just don't trust buying from them....
I'd go for the shampoo & set Col, would suit you better