These are nice disposables. They're tapered on the edges so they should lie pretty smooth under clothing, even with non-padded bra cups, and they absorb really well.
Lansinoh Disposable Nursing Pads 20370 offer effective, discreet protection from leakage. They have a special absorbent polymer and stay-dry lining to draw milk away and into the core of the pad, keeping the skin and clothing dry. Pads maintain form and smooth shape even with the heaviest flow so you can get all of the protection and none of the bulk.