Some reviews:
http://thatfantasyblog.com/?s=the+banned+underground
http://www.fantasybookreview.co.uk/blog/2012/05/20/the-mystic-accountants-by-will-macmillan-jones-reviewed/
http://www.booksquawk.com/search?q=the+banned+underground
http://awesomeindies.net/2013/04/11/review-bass-instinct-the-banned-underground-book-4-by-will-macmillan-jones-fantasy-contemporary-humor/
http://fantasticalimaginations.wordpress.com/2013/04/11/review-bass-instinct-will-macmillan-jones/
http://www.authorstowatch.com/2013/04/book-review-bass-instinct.html
http://www.ignitebooks.blogspot.co.uk
Ignite is a top Amazon Reviewer. Check for the author's name to see her views on the series.
http://fantasticalimaginations.wordpress.com/2012/12/08/review-the-vampire-mechanic-will-macmillan-jones/
Authors to Watch:
http://www.authorstowatch.triciadrammeh.com/2012/12/book-review-vampire-mechanic.html
Where to buy:
Note that all books are available as both ebooks and paperbacks.
The Amazon links are to the Kindle versions, but if you move to the book page, then the paperbacks are there.
Each book page has the Amazon link, the other platforms are shown separately!