I ordered through Amazon yesterday, and got my beta activation code this morning from them via email.
quote Amazon
Release Date: Friday, November 2For all pre-orders placed up to and including Sunday, September 30, beta codes and redemption instructions will be e-mailed to you on Tuesday, October 2. For all pre-orders placed after Sunday, September 30, beta codes and redemption instructions will be e-mailed to you within 24 hours of placing your order.
You will not be able to access the beta until around two weeks before release (to be confirmed), so keep your code safe until then.Incentives received:Pre-order Football Manager 2013 from Amazon.co.uk and get early beta access two weeks before the game's release. You can play as many seasons of the beta version as you want, however the beta version will be de-activated the Monday after the full game launches (November 5). To continue your Football Manager career, you will then need to install your full copy of the game.
Offer strictly subject to availability. One code will be issued per order. If you require multiple codes, you will need to split your purchases into multiple orders. A broadband internet connection is required to redeem the incentive along with an active Steam account.