The standard Blue Diacock should be fairly easly to find as its a pretty popular design. Probably worth sifting though the internet for official Evisu dealers based in the UK or Europe, there are loads of them. Failing that try E bay, there are a number of official dealers selling deadstock at some good prices. Bagga have this style in Red, Yellow and White if thats any help. Evisu Jeans and Clothing - Bagga Menswear
Not heard of Bubbleroom before, but the pics they put up of their Evisu all show pics of the turn ups clearly and they are selvedge denim which is promising. Also they carry other high end brands so its probably safe to say that what they stock is all genuine gear