Microsoft Mobile 1GB Bluetooth Memory Mouse 8000 for $25.00 shipped.  Here is a screenshot for your reference.  It has a transceiver with 1GB flash memory that serves as a fully functional flash drive, uses 2.4GHz wireless frequency, and is USB rechargeable, along with battery life LED indicator.  Note that this mouse can work wirelessly in either Bluetooth mode without the receiver or standard mode with the included receiver.  Most places have it for over $50.