A new report from real estate company Zillow this week found that hundreds of U.S. cities and towns now have starter homes that typically cost $1 million, including 10 in Massachusetts. Surprisingly, Boston is not on the list, as Zillow says an entry-level home in the city is worth just over $514,000. But the wealthy suburbs around Boston, as well as some island towns, did make the cut. Zillow defines a "starter home" as a house in the lowest third of home values in a given region.