Where can I buy an oversized check (those giant novelty checks)? And I need to put my company logo on it....?

My company is hosting a charity event, and we're also making a big donation to the cause ourselves. I need to buy one of those big checks, but I don't want to just write in all of the information with a marker. I'd like it to be printed nicely and have my company logo on it (the way that they have the Megaball logo printed on the giant lottery checks). And I don't want a plain white one either. Does anyone know where I can find one of the full color large checks like the ones that the state lottery uses? Thanks!