Got an email today, just wanted to point this out...
Strings and Beyond has several sizes of Boomers and one size of Dean Markley Blue Steels on special for $9.95 a set. Also some $2.99 a set deals on several guitar strings. Free shipping over $35.
I've ordered from them once, would do it again. They don't carry a huge selection of bass strings like some others, but they have good prices on what they do carry.