My favorite is kissedbythemoon.com. Shipping is free and I've never paid full price for anything. Also, there are different tiers, so depending on how much you spend different freebies are thrown in. I've gotten free CJs butter, 2 free wet bags, free cover, free AIO, free book, free Kissed cash, etc. Also, you get points for every dollar you spend and then you can redeem the points for "kissed cash" to spend when you shop. I just ordered 3 of the brand new Thirsties Duo AIOs and got them for just $35 total because of the great sales. Since I discovered her store, I haven't shopped anywhere else. The CS is fabulous too.
If you like her FB page, you'll be updated to the giveaways, flash sales, specials, etc. Oh, and sign up for the newsletters for extra codes!