Spotted this on twitter.
Angry Robot Books is having a one day sale today, 50% off anything in their catalog.
Files in epub format, with instructions on site for loading to Kobo, iPad, or Nook. Not suitable for Kindle.
I just bought Blackbirds by Chuck Wending using this deal. The conversion rates seemed to vary throughout, but in the end I got charged $3.11 (it currently sells for $6.01 on Kindle), paid via PayPal. Note: a lot of this publisher's catalog sells for $2.99 on Amazon (i.e., Zoo City by Lauren Beukes) or is sometimes available on Kobo and coupon eligible, so this sale is in particular good for any of their their non-discounted titles.
Sale runs until noon on Saturday, May 5th (an I assume that's noon in England, not US).