If you're in the US, follow some sneaker twitter like:
https://twitter.com/SOLELINKS
https://twitter.com/snkr_twitr
https://twitter.com/JustFreshKicks
They announce sales/codes/new releases.
Careful though, you might not resist it lol
I'm in the UK but I actually ordered the triple black 4.0 last night which arrives today. I couldn't resist.