Ask HN: How do you find a good manufacturer?

My wife and I are in the web design/development business (long time HNer) but we have a "side project" that requires us to manufacture a physical product. Without going into details and revealing our idea, it's essentially as complex as a "cereal bowl". The only requirement on material is that it be able to sustain hot temperatures (similar to a hot bowl of soup) My question is, being a web hacker I don't know the first thing about finding manufacturers and effectively working with them on this product. Is there a good online resource for finding manufacturers? Have any of your worked with good manufacturers on a small-ish scale? We're not looking for Wal-Mart volumes, just a small affordable supplier that can work with us to make the best possible product. Thanks HNers!