I want to call everyone's attention to a new auction site, Agora Auctions. They are already up to sale #4. I purchased a coin from sale #3 and it looks exactly like the picture. I have met the owners and they are good guys. The current auction closes on Tuesday.
Auction #4 has the usual good-quality Greek and Roman stuff but there is also some of the lesser-known stuff worth looking at. They have Parthian (including Bronze), Sasanian, and Kushan coins. I was surprised to see a Baktrian fourree. There is a nice run of medieval Islamic stuff.
For folks interested in replicas there are some Peter Rosa replicas of Greek coins in the British Museum including beautiful coins of Syracuse such as this tetradrachm, from Wayne Sayles' collection and illustrated in Classical Deception.
Don't skip the Group Lots! The auction isn't just dealer lots. The Roman Provincial brockage lot seems nice.