Well, in the old communist countries. ., the ones with a lot of rural areas. . .It would be relatively easy to get quite a few very very old and very used anvils.
If you;re lucky ..you could also find some very heavy industrial cast steel anvils. . if you know where to look ( i don;t .. but i think i know some people who know some people ..)
the majority of anvils are under 70 kilos ( ~ 150 pounds ) and are very used. .and have a saddle shape going on, the predominant styles are the austrian type, stake anvils and czech and german copies.