Hackaday (http://hackaday.com/)
I have to say, and regret to say, that so far I haven’t bought any of their stuff, so can’t comment on that- but they are one of a few sites that all of my browsers are set to open into automatically on loading. Some of their content is VERY technical (but often fascinating), some of it is tech news, some tech opinion, and I find a high percentage of their articles of interest. Highly recommended if you are (like me) a hard-core techno-geek.
– Robert the Wombat
Hackaday