Anything below 6.25$ must have somekind of a caveat included to make it profitable. The cost of .com and .net domains is 6$ for all registrars, as Verisign charges that as the registry fee. Then on the top of that is 0.25$ as a management fee to ICANN. Right now I'd look as you at getting your name from Go Daddy with the coupon codes. The cheapest you can get is 6.47$.