I've noticed that a lot of historical texts lack much in the way of maps (excepting the Landmark series) so I wanted to get a good atlas that I could refer to while reading. Strassler recommends The Barrington Atlas of the Greek and Roman World in his preface to The Landmark Herodotus but it's nearly $400.
First, is The Barrington Atlas of the Greek and Roman World good? Does it justify it's price with it's quality? Second, are there any alternatives of similar quality but lower price?
The Barrington Atlas is in fact wonderful. Not for everyone to drop $400 on it though. In fact I've only seen one copy in my life.
Look at the Ancient World Mapping Center. It's a little tricky; it's online instead of in book form, and I think the UI is still being developed. There are some useful links on the righthand side too.