I’ve been using this site, Retail Me Not, and its sister site, Bug Me Not, for a while, and figured I’d mention them on here.
Basically, the sites function as follows:
BugMeNot: Enter a website address you need a login for, and multiple logins will be displayed for you to use freely. Logins work 90% of the time, but some sites are blocked from the BMN or just have bad logins. It’s a rare occasion if I come across a site I can’t find a login for.
RetailMeNot: A great resource for discounts, generally for online shopping. RMN provides codes and lists specials from sites such as Amazon, Apple, and NewEgg. Some examples of recent discounts and deals can be found to the right of this post.
That’s it! Enjoy! 
Fun fact: I got $25 to Threadless for posting this!
