for the other flat ladies looking for well-fitting bras, as far as cheaper things go, i'm a big fan of those stretchy american apparel bikini + racerback cotton bras, and for still-cheaper-than-eres-or-agent-provocateur, calvin klein actually is awesome for smaller sizes, and definitely has bras down to 32A. (hello, kate moss has never really been the poster girl for cleavage.)
i find it's really difficult to find bras in my size that aren't a.) just lace/stretchy or b.) super padded uber pushup types. (like, ok, i know i'm flat and all, but sometimes i don't want nips OR cleavage but still want a lil' support, why do we not make bras that will just FIT?) and most of the Calvin Klein smaller sizes are still just 'regular bras.' thick and a lil' bit of wire, but no extra pads or contraptions to squish you together into something totally unnatural.
i've got a few of these:
http://www.calvinklein.com/product/i...ductId=3569249 and
http://www.calvinklein.com/product/i...ductId=3171552 and they're quite decent.