I've bought most of them on trips to the US. I have a couple of favourite antique haunts that I frequent when I'm in California. A 90 minute the drive up the coast from LA takes you to Ventura, a positive Mecca for vintage lovers and where some of my collection was found. http://www.ventura.com/activities/shopping/antiques/
Another favourite spot is San Juan Capistrano (below), south of LA on the way down to San Diego - you can take the coast train from LA's amazing art deco railway station. I never leave here empty handed!
I've saved my favourites for last. I adore this pretty pair of angels - lovely for a Xmas table. And who could resist the cute penguin set?
Sadly this chirpy fellow has lost is other half :-(