Now also free @
Sony (available to Canadians) and in ADE-DRM ePub & PDF
direct from the publisher (US & territorial addresses).
Kristine Grayson happens to be the pen name of former
Magazine of Science Fiction and Fantasy editor Kristine Kathryn Rusch, and she offers every week a new online fiction short story from her backlist, which she normally sells for 99 cents on Smashwords (available bundled for less).
The stories are mostly sf/fantasy/mystery and rotate every Monday and you can keep up with the latest ones here on her blog:
Free Fiction Mondays.