Story updated with Best Buy information.



) -- Nabbing one of


(AAPL) - Get Report

new iPhone 4 smartphones on June 24 is turning out to be an incredibly difficult feat.

According to a blog post on



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, one of the few retailers lined up to sell the Apple iPhone 4, has said that if consumers haven't already pre-ordered the phone, they probably won't get one.

"If you didn't pre-order

the iPhone, then on the 24th, most likely, we will not have it available for purchase," a Best Buy sales rep told

. "We do not know how many phones we will actually have in the store on the 24th, if any."

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Investors, retailers, and even Apple seem to be anticipating a big shortage of iPhone 4 supply for tomorrow, the first day of the smartphone's general availability. Yesterday,


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reported that the iPhone 4 wouldn't be available in its stores until June 29. And last week,

Apple itself pushed back the online shipment date for new iPhone orders

on its Web site.

Apple, which is facing

an onslaught of phones built around Google's (GOOG) - Get Report Android operating system

, is clearly off to a flyer with the new iPhone 4.

During Apple's recent second-quarter results, iPhone shipments climbed a massive 131% compared to the same period last year, reaching 8.75 million devices. iPhone revenue also rose dramatically, reaching $5.45 billion, compared to $2.43 billion in prior year's quarter. iPhone sales now account for around 40% of Apple's total revenue.

Best Buy has advised customers that have not pre-ordered a new iPhone to call ahead to their local store to see whether additional iPhones are available.

-- Reported by James Rogers in New York

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