Speaking of B-Flets optic fiber (which we use at home),
NTT are having a "get your first 4 months free" campaign. Many moons ago, when I signed up I got 3 months free. I canceled and signed up again to see if I would get another free months free and sure enough I got it - but they had to disconnect me for a week.
A week without "teh Internets" is like a week without water for me and was incredibly painful - never tried that stunt again ^^; Besides, I only pay something like
5000 yen -
6000 yen per month for the optic fiber connection while other countries have to pay much much more for the same type of speed.