Hi yingzy, I bought my bottles in US when I made a trip there during my first tri. My friend who has a 2 year old son uses NUK and Playtex and she has a variety of those cos she switched around till she found the most suitable one for her son. I wound up getting the Playtex Vent-air and Playtex Drop-ins as they claim to prevent colic. She mentioned that a few of her friends swears by Dr. Brown but she feels that there are just too many parts to wash.
Of all the housework, I dislike washing dishes most, so my choice was rather easy. You may want to look at the teat material as well. Apparently latex ones are more similar to our breasts and if you are breastfeeding, it will make the transition to bottle feeding easier.
Amazon sells baby items at pretty good prices. If the shipping is reasonable, then you may want to consider.