Ohh, yes, I found a great ebay store that sells affordable and nice looking BFing tops.
Mmmm, I wonder... I have large-ish boobs that are relativley low (even before the sag factor played in). I also have a relatively short torso. I guess someone with smaller, higher boobs and a longer torso would show a lot more tummy than I do. When I sort of hunch over, you can see hardly any tummy as most is covered by bub. If the clothes you wear are a little on the loose sight, that also minimises the "side view". But yes, i agree, BFing friendly clothes are a big asset.
If you don't want to spend much money, you can do the 2 singlets or singlet plus button-up shirt. BFing singlets with a shelf-type bra might make a maternity bra unnecessary for smaller breasted women (after the first few weeks when the supply has settled).

I just looked at Target yesterday and they actually do a maternity T-shirt which has a crossover front and fals "modesty layer" underneath. Comes in a few different colours and not too exxy. Queenbee also has quite a large collection.