The release of the K-ON! Blu-ray edition has seen a new opening day sales record set, with the Blu-ray edition selling 33,000 copies, with a further 8,000 sales of the DVD edition, a total which makes it the best selling TV anime of all time, and one of the best selling anime titles ever.
The main contenders for TV anime opening day sales records are mecha anime:
Code Geass Volume 1: 36,634 (68,821 total)
Code Geass R2 Volume 1: 25,955 (59,041 total)
Macross Frontier Volume 1: 17,548 (64,981 total)
Moe moe kyun!