Out of curiosity, where in Taiwan did you buy them? Just a bike shop? I visited a few while I was there and there was a big range of folding bikes available in the ~$100-300 range.
First I searched the Net, such as: class.ruten.com.tw
Then I went to the stores, (1) take subway to Taipei city gov. station, walk on Gi-lung Road to the end,
松山基隆路1段6號方程式單車工坊 ($85 aluminum bike, NT$2,500)
(2)
中壢市中北路二段４６８號 (where I bought BAHIS B3)
Take train to Tao-Yuen and walk to the store.
I put BAHIS B3 in the bag and took the train to Tairoko, from there I biked along the east coast hi-way to Kenting. Took train again to Koahsiung and then hi-speed train back to Taipei. You would have to pay one full ticket for a non-folding bike on train.
I stayed with a friend on 忠誠路 and had my daily meals at department stores 新光三越 and 高島屋. The foods are fantastic.