I did not buy any maternity wear at all!
Find them very expensive and cannot wear after pregnancy. you can try maternity shops like Spring but i dont find their things nice.
So i bought baby doll dresses and tops from shops like M)phosis and leggings from Cotton On...Most of them can wear till i am 37 weeks now and still can wear after pregnancy!
As for bra, i bought those bra extension...hee...i sound so cheapo