Apple has detailed supply issues for its iPhone 3GS at its retail stores, but there seems to be ample inventory of the 32GB white version.
A spot check of Apple's iPhone 3GS widget details sellouts in most states for the 16GB iPhone 3GS (Techmeme). The black 32GB version is also mostly sold out. If you want a white iPhone 32GB 3GS---apparently not enough people do---you're in luck.
Here's the situation in Pennsylvania:
And New Jersey:
Other states including California show similar trends.
Among other odds and ends:
- New York City's Apple stores---SoHo, Fifth Ave. and West 14th Street---are well stocked in all iPhone 3GS flavors.
- Apple says that its 8GB iPhone 3G is available in all stores.