The Fountain is currently available only on Amazon, in a Kindle edition, at $2.99 (or less during special promotions).
Buy Waiting for Westmoreland from your favorite online store, wherever you are—including the following (if you want it in paper at a discount, scroll to the end for the 40% discount at Lulu):
Amazon—Tenth Anniversary available in paper at $16.95 and Kindle at $3.99
iTunes Books—iBook at $3.99
Kobo–eBook at $3.99
Lulu.com—available in paper at $10.17–which is 40% off cover price; also as an eBook at $3.99