Disclosure: This post contains a referral link.
Okay, I'm just going to make this the day that I spam my blog with sales. It's not what I usually do, but it's what I'm doing today. I blame you, Amazon. Macy's has a big beauty sale going on, and among other things, BL polishes are $7.50. And everything has free shipping, apparently. Check it all out here.
Ebates also has an extra 8% cash back for Macy's, so your best bet is to shop through their link. There's no downside. (More info about Ebates here.)