Orders for both Wi-Fi and 3G models pushed back 7 to 10 business days



Source: Apple.com

From the start, Apple AAPL has had trouble getting enough iPads in stock.

In March, it couldn’t meet its own shipping schedules and had to push back the device’s U.S. launch to April. In April, it pushed the international launch back to May.

Even then, Apple has had trouble keeping its retail stores supplied. Three days after the 3G version went on sale, 49 out of 50 Apple Stores reached by Piper Jaffray’s Gene Munster had run out.

Last week, online orders were taking 5 to 7 days to ship. Today, according to Apple’s online store, they won’t ship for 7 to 10 business days.

Apple has said its iPad problem is not supply but demand, which has exceeded its expectations. Munster suspects it’s a little of both.

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[Follow Philip Elmer-DeWitt on Twitter @philiped]