It's only 15% off today and Strings & Beyond (http://www.stringsandbeyond.com), but thought I'd give a heads up because I love ordering strings there. The code is: aprilfools.
The shipping is insanely fast. It's never been longer than 'the day after tomorrow' before i got my strings. They also load you up with free picks. I'm tempted to join their subscription service.
Thanks!
...and they also carry Monkeyman Guitar straps along with the huge selection of strings and picks.