Early Supplies of iPad Accessories Dwindling?

Good news for iPad peripheral peddlers: High demand for some Apple-designed accessories for the device appears to have exhausted early supplies. Originally offered with a ship date of April 3, official iPad cases purchased today, for example, won’t ship until mid-April (if you purchased one on March 12, you’re still likely to take delivery on April 3 according to my order status checks).

Keyboard docks ordered today won’t ship until late April (those ordered on April 12 are scheduled to arrive on April 19). And 10W USB power adapters, which let you charge your iPad via electrical outlet, won’t ship until May–nearly a month after the arrival of the iPad itself.

A case of first-come, first-served, I suppose. Still, this gives third-party accessory vendors a nice little sales window free of competition from Apple (AAPL)–assuming they’re ready to take advantage of it.