Well, let's see if we can help you.....
* Mouse (animal) - most pet stores have these available
* Mouse (computing), a computer input device - most computer or discount stores have these available
* Mouse (programming language), a computer programming language - not sure how or where you get this
* G359.23-0.82 "Mouse", radio nebula with the pulsar PSR J1747-2958 - I'm sorry, nebulas are not currently for sale here on earth
* Stay mouse, a part of the standing rigging on some sailing ships - I'm thinking you could get this at your local antique sailing vessel store
* Coal mouse, a small cardboard box containing a small amount of magnesium with a fuse - usually available at a local coal dealer.
* Mickey Mouse, an Academy Award-winning comic animal cartoon character who has become an icon for The Walt Disney Company - available at Disneyland, Disneyworld, online . . . that freakin' mouse is available just about everywhere on everything
* Mouse (anime), a 2002 anime TV series - available at Amazon.com
* Mouse, a character from the film The Matrix - don't think you can buy this one, unless you buy the movie
* Mice, a race in The Hitchhiker's Guide to the Galaxy - not currently available for sale
* Stanley Mouse, American artist best known for rock posters and album art for The Grateful Dead and Journey (band) - some available at gallerydirectart.com
See also
* Maus, the German word for mouse - available at most bookstores or comic shops
Good luck!