Seems like you'd get a Pi Zero before you'd get a chip. They don't start shipping until June, and I see Zeros in stock for a few seconds (some on Adafruit yesterday, although they sold out in seconds).
I have a CHIP, from the Kickstarter campaign. It really is a better deal than the Pi Zero, unless you have Pi-specific needs. It's much more powerful than the Zero in my testing (though not quite as powerful as the Pi 2) and the built in Wi-Fi/BT is awesome. The fact you can attach a LiPo battery and have it managed by an onboard power regulator is worth the whole $9 as far as I'm concerned.
The only downside is no HDMI or even VGA until the respective adapters come out...in June. I currently only have one screen in the house with a composite input and it's not always available for tinkering.
Another downside is the size of the community. I think this is why the pi is going to be around for a long time despite not having the best tech specs around. There are all kinds of tutorials for hundreds of projects and the prevalence and availability of rpi forums further lower the barrier for entry.
