found this on their merchant data page today:

1.26.05 Program Updates

Dear Affiliate,

Best Buy is in the process of updating its reporting to serve you better. During this upgrade, which will last approximately 1 week starting on 1/28, all reporting will be delayed. Please note that all sales will be tracked and you will not lose any data. You will be able to access past data when the upgrade is complete. If you have any questions regarding this upgrade, please contact us at

Sales data is complete through January 24th. Thanks for all your patience while we work out reporting issues.