Through exchangers.
Those one mentioned by bigB.
Or:
Gaxee.com
my-xchange.com
exwp.org
swapgold.com
ecardone.com
planetwm.com
goldexpay.net
xmlgold.net
moneystream.ru
wm-center.com
ermoney.com
buywmz.com
You have many exchangers
1, www.planetwm.com
2, www.wm-center.com
(they are the same of course)
But be carefull, I have ripped with them for 500WMZ
buywmz is the best at the moment, you can buy with liqpay or use a credit card and have it delivered by pin or sent to your account within a few hours.