Hi,
In the 1930s, the German company Heinrich Lanz A.G. had as much as 60% of the tractor market in Europe, and its tractors were exported worldwide. You can find them all over Europe, from Norway to Greece, but also in Australia and Brazil. Most Lanz Bulldog tractors can be found in Germany, the Netherlands and Belgium, but they are very desirable and quite expensive there. You can get tem cheaper from other countries.
I was close to buying a complete Lanz Bulldog from Norway for little money, which was used by the German Army to build coastal fortifications in 1941.
A cheaper alternative are very similar Polish Ursus C-45 or Argentine Pampa.
Good luck