Here is a yahoo domain coupon code courtesy of Domain Promo Codes that can be used for personal or Yahoo 1.99 small business purposes.
The coupon code is free to use so make sure you input it in the form field where it asks for a coupon code and you should be able to get almost $2 free of your total charges.
Here is the Yahoo 1.99 domain link.
Register .Com domains for 1.99$ only.
for more yahoo domain promo codes http://domainpromocodes.com/coupons/yahoo/
There are other coupon codes for a Yahoo 1.99 domain. You can check the coupon portal from time to time to find new coupons all the time