Anderson Valley makes a great Gose. For other sours, I'd suggest any lambic: Boon Oude Gueuze (mariage Parfeit, etc), Lindemans Cuvee renee, Hanssen's, de troche oude gueuze, timmermans limited edition oude gueuze or oude kriek, Oude Beersel, St. Louis gueuze, Tilquin.
For Great american sours/saisons, I'd highly recommend Allagash (lots of sours, allagash.com should give you a good idea of what is available), Oxbow, Cascade, Wicked Weed, Almanac, etc
Be warned, outside of Gose, sours can get very expensive! (as in $10+ for a small bottle! Just about every sour is single-bottle, small or large format, but not 4 or 6 pack). But it's worth it occasionally!
Sours are a very wide spectrum too. There are many different styles; fruited vs non-fruited; aged vs fresh; barrel aged; super sour vs less aggressive but more funk; and some are just not all that good. So don't get turned off if you try one (or a bunch) that you don't like, there's a ton of variety.