This incredible offer is back. The previous offer that was available in April is described here. All you have to do is sign up for one of the specified Amex Business cards through the link provided and make a purchase by April 30, 2007 to receive a $250 statement credit.

The business cards included are:

• Business Platinum Card — has an annual fee of $300 for the basic card
• Business Gold Rewards Card — has an annual fee of $125 waived for the first year
• Platinum Business Premium Cash Rebate Card — has no annual fee
• Platinum Delta SkyMiles Business Credit Card — has an annual fee of either $135 or $80, depending upon your qualifications

So, if you’re planning to apply merely for the signup bonus you’ll want to get either the Business Gold Rewards Card or the Platinum Business Premium Cash Rebate Card to avoid the annual fees.

The offer is available here. Technically speaking, it is only available to people who saw the offer in their free issue of Inc. magazine. You may also be required to show proof of having a real business, so YMMV. Credit to FW.