Indie-Resource.com

I just went to look for an AngularJS book, and saw that all of their ebooks are $5 on their website. They have been my favorite tech book publisher for some time now, so I am about to go ape over here on a pile of reading for the new year

EDIT: They have a very nice game development section covering a ton of topics not covered by other publishers.

Oh, just found Unity Multiplayer Games, which could be interesting to some folks here. For some reason you can only pay in Pounds, but Paypal can sort that out, and it should still be $5.

I just wanted to add that this is still going on, and for all of those learning Impact, the best ImpactJS book available, HTML5 Game Development with ImpactJS is on there for $5 as well (for all major ebooks formats, including PDF), down from $27 or about $17 for the Kindle version (which many of us know is not the greatest for programming books since Kindle formatting does not respect code blocks).