Impossible Books is an indie distributor based in London (and so this sale will be most useful to those in the UK). They have excellent taste, and micro-pub fans will recognize many of their favorite publishers (Koyama, Retrofit, Oily, Youth in Decline etc.).
Impossible currently has 347 (!) books in their catalog, quite a number. This week only, 101 of those titles are discounted from 9% to 33%.
Since I live in America, I don’t think I’ll be making an order anytime soon. But I will be keeping and eye on their blog, which profiles the new titles and is updated frequently.