1. be prepared for a new beardie. Have a food source ready, and have the proper enclosure set up.
2. Try classifieds, like the fauna classifieds or king snake dot com.
What kind of dragon are you looking for?
I would go with a breeder that others here have had experience with. Find the type you want (color, morph, price), then start hunting the one that fits you best.
Good luck, you're doing the right thing by asking questions first...not after you get a beardie!