Ross, with the recent site changes, locations of members are no longer shown on each post, but I think I remember you being in the US (eastern seaboard?). You are stuck with second hand copies in North America until this summer, when each book of the series is being re-released at the rate of one a month (CotMW in May, SoM in June, WoV in July, and then, for a break, TRHC in August. Arc III books will apparently be released in the fall, leading up, I suppose, to the release of Initiate's Trial.
To get FP, order it from this link:
Amazon.co.uk: Fugitive Prince
It costs about $15 USD, and your shipping will be a similar amount, so it will cost you about $30 USD all in. Given your obvious addiction, this does not appear to be an obstacle for you!
There are always the 2nd hand copies (some of the hardovers were cheaper than the new paperback), which I found in abundance on amazon.co.uk, but the only problem with them is that the author does not get paid, and let's face it, Janny deserves some coin for this amazing series. I am sure you could find 2nd hand copies at amazon.com, and at ABE books, etc.
Cycle of Fire, Master of Whitestorm, This Way Lies Camelot, and
Sorcerer's Legacy are all out of print, so you must get second hand copies.