Where to find second hand scooters?

I live in a small town in Miaoli County. I have been to 8 different shops here and they all carry the same selection of used scooters - air cooled, drum brakes and usually the largest is 125 cc.

I would really like to get a watercooled scooter with front and rear disk brakes. I would also prefer a bike bigger than 125 or even 150. Am I going to have to go to a larger city, like xinzhu or taizhong to find shops that sell this kind of bike second hand? Is there a website or publication that focuses on used vehicles in Taiwan, similar to “Autotrader” in the U.S.?