Odd, the links for books 1,2 & 3 didn't work for me. (But I just searched on the titles.)

Field Guide happens to have a nice Kindle Edition that I just picked up.

Lastly, I thought you might appreciate the subject of an email I got from Amazon this morning:
Now available: "Late Eclipses (October Daye, Book 4)" by Seanan McGuire on Amazon.com‏