I tried purchasing musa mekong giant last year however they never made it through the winter when I tried planting them outside. The appeared to still be alive by the spring time however too much moisture in the spring must have killed them out so I ended up ordering a couple more of them from eBay this spring. Here's the links to when I tried them last fall.
http://stevespeonygarden.blogspot.com/2011/10/new-banana-plants-musa-mekong-giant.html
http://stevespeonygarden.blogspot.com/2011/10/fall-update-on-banana-plants-2.html
I bought them as tiny plants in 2 inch pots some time in April of this year to replace the ones I lost last fall.
3 May 2012
Plant 1 on the right, and plant 2 on the left.