I don't know that much about mastercoin but, there appears to be 2 different coins out there both claiming that same name, MST/MSC. See: What is the difference between MST and MSC? @ http://wiki.mastercoin.org/index.php/FAQ#What_is_the_differe...
MST listed on Cryptsy https://www.cryptsy.com/markets/view/62
MSC for sale @ http://www.buymastercoin.com/
Also see http://coinmarketcap.com/ for MSC price.
I don't know enough about either one to recommend, it's just info I came across.
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