All it takes is $5 to open an account and promo code DM-2-1106 to save up to $200.* Just use promo code before 1/15/07. Then pay only when your search ad is clicked. In my experience cost per click prices can be lower than with Google AdWords.
The small print (my emphasis):
* Promotional Guidelines: Offer valid only through 1/15/07 (midnight Pacific Time). Promotional credit is valid only for new advertisers opening a new account with Microsoft® adCenter. The $200 promotional credit does not apply to the one-time $5 activation fee required to open a new account. Promotional credit must be fully redeemed in click spend within 90 days of sign-up. Advertisers will be charged for advertising that exceeds the $200 promotional credit. Advertisers will need to suspend their ads if they do not wish to receive additional charges beyond the free credit amount, or after 90 days from sign-up. Promotional credit good only to residents in the 50 United States and Washington, D.C. Limit: one promotional credit per customer. Promotional credit may not be combined with any other offer or discount, separated, redeemed for cash, transferred, sold, or bartered. There is a minimum bid requirement of $0.05 per clickthrough. Search listings are subject to editorial review. See Advertiser Terms and Conditions for more details at sign-up. Other terms and conditions may apply.
