oh the cannabis oil? haha...sorry can't help you with that. i'm surprised they don't have any over there. we have everything here, fresh bud, oil, edibles, waxes...glad to see america's still on the cutting edge of something.
well, if you can get some good bud, you can actually make the oil yourself. it doesn't seem too bad...but yea, a lot of trouble compared to just smoking it or buying oil somewhere. guess you'll have to make it out here to california sometime XD
anyway, enjoy your time in prague, i hear it's an awesome place :) my friend spent a couple of months traveling europe and prague was his favorite destination in all of europe.