Where can I buy .com domain most cheaply?

Use another family member's name (should be new for godaddy, i.e., create a new email account and a new godaddy account) and buy a new domain name for 0.99. When you want to register another new domain, then use yet another family member's name and repeat. The address can be kept same as your own address. You may buy a new sim, or use your family member's sim/mobile number, and you'll be able to get the discount.P.

P.S.:
I've used the above method in Godaddy India and have got 3 dotcom domains for their cheapest scheme (only for new customers, INR 99 + tax = INR 111 only, which is less than USD 2), using first in my name, then my daughter's name, and the latest in my wife's name. In each case, every family member's mobile number was used, but the address remained the same. For payment, I used the same bank online transfer details for all those domains.

After researching on BHW I settled on NameSilo. Their domain with privacy is $8.99 which is about half of godaddys price once you've used the 2x0.99 coupons up. They also charge the same price for renewals. Privacy is expensive but this option is a lot cheaper than godaddys. I also did a search online and found a coupon which brought the price down to 7,99 not sure how long that'll work for though.

or get yearly hosting of ipage and you get domain for free and you will need the hosting anyways.

Godaddy will give you $0.99 price if you have a new account. They don't provide that discounted .com to existing accounts. So you now know what to do

Yeh... add your fav dog's name and email and join godaddy. Then use the cat's, then use the rats... then the mat's... and get the 0.99 discounted domains for each. Use the same address, a different mobile number, the same bank details, the same PC, the same net connection, ... for purchasing the new domain. If godaddy rep calls, use the same voice too. When you can, transfer those domains in your name if you wish to.

Look around for coupons and godaddy is the right place .