How can I get a replacement battery cover for my Motorola Z6w?

I bought the Motorola Z6w from Future Shop (under Fido) recently and I tried to take out the battery cover to put in a memory card. Because I was stupid, I didn't look at the instructions of how to take out the cover (turns out you have to push down a small button on top). Anywho, it cracked on the top part.|||This might help: http://www.store.motorola.com/mot/en/US/鈥?/a>