People need to stop focusing on the Sept 30th date, its getting rather annoying with post after post of the same question, should I buy now or wait until sept 30th/Oct 1st.
Apple chose the date, September 30th, because that is the last day of their 2010 fiscal year and the last day of the financial quarter. At the end of every quarter, Apple (as well as many other companies) have to announce their quarterly earnings and losses, which means that Apple has to decide if they want to continue to loose money and continue to hand out free bumpers and 3rd party cases (wether it cost $1 to make or $29, its still a lose) or if they feel that the media craze has settled enough that they can continue to sell them at $29 price tag, which is why Steve Jobs said during the July Press Conference:
"For every iPhone 4 purchased through September 30th, we'll re-examine this is september and decide wether to keep going or maybe we'll have a better idea."
Additional Info:
United States
The U.S. government's fiscal year begins on October 1 of the previous calendar year and ends on September 30 of the year with which it is numbered. Prior to 1976, the fiscal year began on July 1 and ended on June 30. The Congressional Budget and Impoundment Control Act of 1974 stipulated the change to allow Congress more time to arrive at a budget each year, and provided for what is known as the "transitional quarter" from July 1, 1976 to September 30, 1976.
As stated above, the tax year for a business is governed by the fiscal year it chooses.
For example, the United States government fiscal year for 2010 ("FY 2010" or "FY10") is as follows:
1st Quarter: October 1, 2009 - December 31, 2009
2nd Quarter: January 1, 2010 - March 31, 2010
3rd Quarter: April 1, 2010 - June 30, 2010
4th Quarter: July 1, 2010 -
September 30, 2010
http://en.wikipedia.org/wiki/Fiscal_year