MAC Studio Finish Concealer SPF 35 (NC30) 7g/.24 US OZ
($18.00 as of August/2012)
Even since I used Make Up For Ever's Mat Velvet + foundation (my review here, it's still my favorite foundation!), I found myself skipping concealer quite often because of Mat Velvet+'s great coverage. But in summer when I want less foundation or go foundation-free and use BB cream instead, Studio Finish Concealer from MAC works just great. Plus it has SPF 35, which adds another protection to sun spots or any hyperpigmentations!