jackal, as I was told (not so long ago) lots of the Formica species ants are protected in Germany. And this doesn't only mean that it's illegal to sell them, it is also illegal to have them at home. Most of... well pretty much all online antstores are situated in Germany, meaning no chance of buying them.
As I was told, there is another problem with Formicas. If you would have them at home they would most likely die soon due to mould problems.
My advice to you is: buy a Messor queen or a small colony. They had nuptial flights in september so it shouldn't be a problem to buy them. They are very interesting species, they have great workers (soldiers) and they grow into a big colony (more than 10 000).
And another thing, they are easy to keep.
