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NXT Technologies™ Wireless Optical USB Mouse, Black (NX60885) [staples.com] is on sale for $ 2.71 at Staples.
For less than $ 3, this is just a basic, compact wireless mouse.
This is free store pickup (or free ship-to-store if not currently available). Free delivery for Staples Plus members.

IMPORTANT NOTE- I didn’t see "Bluetooth" mentioned in specifications so I think this utilizes 2.4GHz band for wireless connection meaning you need to use their proprietary nano USB receiver.