i wear breat feed mama 鐵線BRA (from Warcol Thailand & H&M) when i am out and at work. much supports. it's cheap (less than HK$100)and very good quality to buy in thailand. You can buy it in materity clothes session in thailand, not bra session of department store.
other choice is H&M. H&M is quite good and pls have a look
at home i want no 鐵線 BRA as it is much more comfortable and more convenient to feed