well.....10000$!! no, just kidding.
It depends who you're buying it from. I suggest just learn to use the program, but if you're doing it online, then you could use paypal. and people are cheap so they would probably rip you off. you want to do this so you wont make the map, but you will get credit for it right? so you have to contact a good mapmaker and ask him to do it. he will offer a price and you could work things down from there.
you will need to tell him/her:
Wintermaul, Pokemaul, Wildkinmaul, Deathmaul, Harry Potter Maul, The Simpsons Maul, South Park Maul, SSBM Maul, Zelda Maul, Gamesmaul, Musicmaul, Moviemaul, Warcraftmaul, Starcraft maul, and many others...
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory