The elusive white iPhone 4 could be in stores by the end of April, according to a new report on Saturday.

[ad#Google Adsense 300×250 in story]Citing sources in Europe and the U.S., 9to5Mac has a screenshot of Best Buy’s upcoming product inventory, which includes the white iPhone. The in-stock date listed on the screen is April 27, 2011.

The report says the product listed in the screenshot is an AT&T GSM model, but a Verizon model is supposedly on the way too. White 16GB and 32GB have reportedly already been shipped to Best Buy.

However, just because the iPhone is showing up in Best Buy’s system, it doesn’t mean it will be released. The white iPhone showed up in AT&T’s systems earlier this year, but it’s still not available.

Apple has never given a reason for the delay of the white iPhone 4, other than it has “proven more challenging to manufacture than expected.