Found 21st May 2014
I realise that you have to be a Costco member to get this deal but it's a good deal never the less. Works out at less than 10p per wash which is cheap IMO. Can't see the deal on their website so don't know if it's a special deal on for a limited time. I picked it up yesterday whilst I called in to have a look at the Birkenstock sandals they had in!