Here in KHH u could go to one of about six used computer shops all situated on the same strip (ChienKuo Rd Computer Market) and take your pick. I’m sure most major cities in Taiwan have their own computer market streets as well…
http://tw.bid.yahoo.com/tw/2092073415-category.html?
Yahoo Taiwan Auctions. Can get some nice stuff there. Just be smart about it when buying from ppl. Always buy from sellers who have good reputations and have completed a fair amount of transactions… thing is tho most sellers are willing to meet to allow you to go and pick up the goods and and hand them the cash after you’ve had a chance to inspect the goods.