Unfortunately, there is no longer for sale, which is a shame. The Microsoft Ready Mouse is touted as the successor to the BOM (Product feature: "successor to the popular BOM with the same product, but with a new name and packaging"). Here the differences from the BOM: Other form (narrower, shorter, higher), much easier, higher sampling rate and a louder clicking sound. So completely different. A replacement for the BOM it is therefore not, that would be probably the Comfort Mouse 6000th
Apart from the marketing lie, you can complain to the Ready little mouse. A well-processing, simple mouse with no extra buttons. It is also suitable for larger hands. The Star there was disconnected for too loud clicking sound.
Who wants to save a little, the Logitech B110 can watch. In form of Ready Mouse not dissimilar and has a 4-way Wheel.