And what kind of fun do I like more than earrings? No kind, that's what. I'm a total earrings-and-scarves hoarder, which I think may be some sort of weird personality issue (seeing as before earrings and scarves it was nail polish, and for awhile it was colorful striped socks with individual toes). But as quirks go it's not a financially or personally devastating one, so I think it's fine.
Shi-da night market - I completely love the guy who sells cheap but gorgeous enamel earrings on the busy street in the market - another woman near the big stationery store sometimes sells them too, along with watches. At NT150 each, I couldn't help but build a collection!
The Indian import store in the Wuchang Street covered market (Wuchang Street east of Bo'ai, near/across from Zhongshan Hall) - with earrings starting at NT100, you can't go wrong. The styles are ethnic, sometimes overwhelming, and very colorful. Also, extremely cheap: these are wear-for-fun earrings, not investment pieces. Also the best place to get earrings in copper tone if you're into that (I am).