Until 6/29/10 MegaMacs.com has the Apple Bluetooth Mighty Mouse (model no. MA272LL/A) for $44.99.  That's $24.01 less than the MSRP of $69, and even after the $4 standard shipping fee this is still the lowest total price we have seen on this mouse by about $7.  Sales tax applies for residents of Oklahoma.  The Mighty Mouse features a seamless "one button" design with right and left click zones under the shell, a scroll wheel that also functions as a button, and two more force-sensing side buttons, all of which are programmable. 

Upgrade to the new Apple Magic Mouse, which also features Bluetooth connectivity, but also has a multi-touch surface, laser tracking, and customizable functionality for $68.19 with FREE shipping at BHPhotoVideo.com.  Save $20 on the Logitech wireless performance mouse MX for PC and Mac, it is now $79.99 with FREE standard shipping.  Or if you are in the market for something a bit more budget friendly, the Lenovo optical mouse is now only $24.99.