A rebuttal book by Ralph Woodrow "The Babylon Connection?" is available on Amazon.
Ralph Woodrow was a Hislop wannabe and wrote a book called "Babylon Myster Religion" which was in the same line of thought as The Two Babylons. It wasn't until Ralph was questioned by a science teacher and had to back up his data that he realized just how many gross assumptions he made (as well as Hislop). Then he wrote "The Babylon Connection?" to clarify and make right what he could.