Check the Asian accessories section of the kitchen department in your local market. Suribachi bowl makes great lather.
Etsy has really interesting and unique items. Of course, ebay is also a good choice. Maggardrazors.com has options as well. If you are on a budget, you can easily use a mug or tupperware bowl from your kitchen. I also like to browse garage sales and thruft stores, and I have located several gems. You may also consider putting up a "want to buy" thread here on TSD. There are people like myself who have many shave mugs/bowls who would sell or trade them.
Amazon? Any small bowl or large soup mug is good. Try in your town. Sent from my iPhone using Tapatalk Pro
Just bought this on Etsy. Not sure how much shipping to europe would be, but they have some really cool stuff on Etsy.
Anything in particular you are looking for? As others have mentioned, you can use almost any type of bowl large enough, or go looking on ebay, etsy and amazon. It's possible to find most types for sale within Europe, to avoid extra taxes. There's also a lot of European based web shops selling shaving equipment