So far i have been to these shops, so share it with you.
1) GMarket - you can find very cheap maternity thighs.
2) ASOS - I already buying some maternity dresses from here..love this website!
2) Kiddy palace - They sell working pants, casual/formal...so i will go buy when tummy get bigger
3) Stylish & Sexy Maternity Clothes, Trendy Nursing Wear, Designer Maternity Dresses, Breastfeeding Wear & Pregnancy Clothes Singapore - centrepoint