Nope, it isn’t, not for one of this size.
If you look over the range of recent release, the price varies:
Justice League Origin is a 12-issue collection at $100 / £90 price point.
The new edition of the Dini-Ross specials is at the $75 / £65 price point - which would be the best one for Overture.
The $125 / £110 price point has been used on the big 20-issue collections of Y The Last Man, Transmetropolitan and Azz Wonder Woman, while Preacher Absolutes have gone up to the $150 mark. But these collections are 3-4 times the material of the 60issue Overture story.
There is precedent for DC being greedy bastards, the Batman Year One Absolute was set at the quite criminal $100 / £90 price point!