Twren---Sorry to be the bearer of bad news but the fine fine on this is that you need to have a minimum cart value of $50 and your post indicates that you did not meet this requirement...maybe you can cancel if you want.
You may also want to change your post so others will not get in on this deal by mistake. Good luck.
*From December 15, 2000, through March 31, 2001, 3Com will award one (1) $15 Amazon.com gift certificate per person, per shopping cart containing one (1) or more eligible products (minimum shopping cart value $50.00) purchased on 3Com.com. For a listing of eligible products, click here. Gift certificates will be sent to eligible buyers within 1-2 weeks of purchase. Amazon.com is not affiliated with this offer. 3Com reserves the right to change, alter, or modify the promotion at any time. Promotion is valid in the U.S. only.