Hello. I had the same reaction, the price is very variable. On the Logitech site it says "No Longer Available", from which I deduce that the successor is the M650 model, also silent and 2 devices (Dongle + Bluetooth). Another interesting model is the Lenovo Go Wireless Multi-Device, a little more expensive but with 3 devices (Dongle + 2 x Bluetooth), but be careful: the function keys can only be programmed in "Dongle" mode, they don't work in "Bluetooth" mode, whereas the Logitech works independently of the mode.