If you live in a bigger town any artisanal grocer should carry something like this if they are one of the higher tiered ones. Usually a spot or two per large town will carry it, and if not, you can request it and they can order it. Online though as suggested works as well.
Folks do you know where we can buy black caviar in Europe? Any thing to look for? I'd like to get something for my mom who tried it long time ago but still remember the good taste. Any ideas on prices ? I know caviar is delicacy, just hoping it won't break my bank!