I've been doing a bit of research into online (large)bra-buying - try
Plussizebras.org for a general resource, and
Bravissimo.com is highly recommended for brand-name plus-size bras (UK).
Undercover Experience is wonderful! It's got all sorts of styles in all sizes!! Go there now! Ooh,
Bras Direct is too cool aswell! I suppose I ought to find something US-based, or I'm not going to be able to help a lot of people (still, it's always harder to find UK-based stuff online)... Ah, here you go:
Bigger Bras and
Creative Woman =)