Welcome to Rabbit and Mouse's Great Capitalist Experiment. At the moment, you can spend your hard-earned dollars on buttons and t-shirts. If you have any specific kind of cheesy merchandise you require, send an email to folks@rabbitandmouse.com and we will think about it really hard.
P.S. - Be sure to check out Can't Afford 'Em Buttons, the really awesome people who saved us from making our own buttons and shirts out of cardboard and lies.
Rabbit and Mouse Buttons - A four-pack of awesome 1" buttons, featuring Rabbit and Mouse, for the low low price of four bucks.
Garmentastic - Simply the most original idea we've ever had: we put our characters on a shirt. White with black writing on a nice American Apparel shirt. That's like, 10 hipster points in the stylish messenger bag.
Note: American Apparel shirts can run a little small. For sizing information click here.