your best experience with potency and delievery. I will name some of them , and you can add your best vendor for best blow:

rushrush europe
easydrugeurope france
weedandco france
wizzardofozz germany
topboy germany
speedlab germany
doraemon france
klasko netherland
heroroyal germany
qualityconnect germany
germanwhite
premiumcocaine spain
napoleon

rate this ones if you have experiences and add new ones so your experience can help to other buyers...
EU only, not UK...