Which distributors and partners are officially authorized to sell Raspberry Pi's?
You need to register your interest before you can purchase:
As already pointed out, the only two distributors are Farnell and RS Components, however they go under other names in different countries. For a complete list see the public wiki page.
If you are deadly keen to get hold of one, then they are available on eBay:
However, you are likely to pay over the list price.
I registered with the RS Components form to express interest. It needs your name and email. I did this on March 3.
They sent me an authorization code and an individual link on May 22 that I used to order.