Echoing previous years, Apple.com has once again posted an easy, online way for iPhone 3GS buyers to check and make sure their local Apple Retail Store has units on hand.

Both 16GB and 32GB, black- and white-backed models are shown, with nasty red squares connoting sell outs and happy green circles, supplies on hand.

So if you're heading out to get your hands on an iPhone 3GS this weekend, give it a try, and let us know how it works for you.

[via MacRumors]

Yeah, we know that Apple has its own iPhone 3G finder but that one doesn't work during store business hours. Plus this iPhone finder searches the Apple Stores closest to your location via Google Maps and is a little bit cooler than Apple's. Location Based Services are all the rage right?

Some interesting tidbits on iPhone 3G availability as of July 16th is that it's sold out in 23 of the 38 states that Apple has retail stores in. And the most difficult model to find is the 16 GB Black version which is only available in 12 of Apple's 188 stores. Apple desperately needs to re-stock those puppies!

So if you didn't get your hands on an iPhone 3G yet, feel free to use the tool to plan your purchase!

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