mingminglei, 32c is a pretty common bra size - most brands that I know of carry it! Calvin Klein & Natori (as mentioned), Elle MacPherson, Betsey Johnson, DKNY (I think), Chantelle... If you don't see it in stock, just ask the SA!
I worked in Nordstrom Lingerie for about four months, and fell in love with underwear! I'm pretty small-breasted (30b, 32a) so it took some digging around to find sexy bras that I loved.
Here are some of my underthings:
DKNY lace tanga (pic taken by me)
Agent Provocateur "Nikita" set - amazing push-up bra (pic taken by me)
Betsey Johnson (again, my pic)
Agent Provocateur "Kitty" (from Agent Provocateur)
This one is particularly beautiful for wearing under v-necks! The lace is really beautiful and sophisticated, and I love showing it off!