I'm already a HUGE fan of Elf's lip glosses. They're highly pigmented, shiny (not sticky), and last forever. Their studio glosses are only $3 a pop and they honestly work just as well as a $20 gloss--in some cases, even better!
The two hues that benefit BCA research are both beautiful pink shades. Personally, I love the Wild Watermelon Glossy Gloss. It's a darker, brighter pink that flatters all skintones.
So buy a gloss, or two (or a bunch)! It's cheap and for a good cause. At least that's my excuse for adding more lip gloss to my already-huge collection.