You can find all you need on
the official announcement.
In short:
- It's released today.
- Couple of online resellers; they are being overloaded so unreachable.
- International shipping should start soon, for now it's mainly available in the UK.
There are 2 models model A (25$) and model B (35$).
The main difference between the two models is that model B has an ethernet port and 2 USB ports.