I work at a mainstream lingerie retailer.
I have also never been to a Frederick's of Hollywood. There's not really many in my area.
I also wear a 30C, which my job pretends doesn't exist.
Frederick's of Hollywood had 30C bras for $10 each. Affinitas push-up 30C bras, that is. Affinitas is a good brand. I like Affinitas. The staff isn't pushy here. The lingerie is a little on the trashy side and there's something about the place that screams "We're like, the Wet Seal of lingerie", but I enjoy it. It doesn't try too hard, you know?
I was also able to score 8 pairs of panties for $20. yyyaasssss