[Frig]

These are not default pricings, they sometimes hold events that allows this.
Godaddy: - at this moment 1cent cheaper normally: 4.99$ more expensive for new registrations

NameCheap:

69 cents more expensive EX VAT.
87 cents more expensive INC. VAT.

That are the origional pricings, stop sales trashing with providing false information.

It's not "sometimes"..
GoDaddy has had coupons that makes you able to buy .com's for less than $2 (ex. VAT) as long as I've been a user.