I got an ad from a Greek firm selling, at a steep discount, many serious ancient coin books (mostly Greek, including SNGs): http://hellenicbooks.blogspot.gr/p/numismatics.html Shipping to the US adds a lot, but not much to EU countries. For example, it has "Ostrogothic Coinage from Collections in Croatia, Slovenia and Bosnia & Herzegovina" by Demo, for which I recently paid $60, at 37 euros shipped to the US. For serious Roman-coin collectors there are a few. There is one on hoards with coins of Maxentius, and one on the Republican coins held in a museum.
