Paige Lauren has everything discounted 50-75% and I'm not sure how much longer it will be available because they don't have many things left [at least in the colors and sizes I have been keeping tabs on]. I am ordering a few more things for Bay from the Fall/ Winter collection. Their rompers [footed and not] are the best, very comfortable and well-made.
Totsy has some great prices [less than $10] on baby and girls' swimsuits right now from Flap Happy Swim. Here are a few cute ones that are still available:
Ideeli has American Apparel for kids on sale right now. It's mostly older kid stuff but if you like their onesies, there are a couple of those on there.