Follow the craigslist's boat section to find something. Almost all the boats in your size and price range go there, not through brokers. Be sure to watch the Seattle listings too. My experience has been that there are more boats than the Vancouver/Victoria area and the prices are better. For $10k, you should be able to get a decent 27' boat like a Cal 2-27 or an Ericson 27. You'll like the extra space with 3 kids.
Don't be seduced by a boat with a low price that "needs a little work". Bad idea!