I should have clarified my reason for asking about Bluetooth mice, although the feedback received has been totally on-point ^.^
I ordered what was described as a "Bluetooth mouse" from Ebay, but what arrived today was a wireless USB mouse...
(It wasn't money wasted; decent mouse, good price.)
...and this made me wonder if all of the matches I saw for "Bluetooth mouse" were vendors catering to clueless users who think "wireless" and "Bluetooth" are synonymous.