The other deal expired and was $1 cheaper.
I wanted to free up USB port and noticed these on special again. Feels nice in the hand and accuracy is okay so far, although I haven't photo-shopped using it.
If using Windows 8.1, you might need to go into device manager and select Bluetooth and whatever your Bluetooth controller you have which has power options as a tab when you select properties, then deselect "Allow computer to turn off device to save power", otherwise it will keep turning the thing off.
MSY has gigabyte bluetooth mouse for 22
http://msy.com.au/product.jsp?productId=3727