Or buy Stranger off E-Bay and get a girlfriend who already owns an X-Brick. :P It's what I did.
Or if you don't have a fantastic girlfriend who also happens to have an X-Brick (that isn't the reason I took her, in case you're wondering), you could simply do the "Buying Stranger" part and play with someone else's X-Brick if you can borrow it off a friend or so.
And oh yeah, don't bother with Munch if you're already into OW. You'll be sorely dissapointed. But if you're not into OW and don't have any expectations about the OW universe, then go ahead.