Forgive me if I'm about to come off as a sadly misinformed smart-***, but I don't think that, for the most part, it matters whether or not your *mouse* comes with a USB bluetooth adapter, as long as it is a BT mouse (as opposed to an RF one or whatever). But in order to avoid having a USB adapter, your computer does have to have built-in bluetooth.
What are desired attributes? Style, ergonomics, lots of buttons / customizability, or something else?