As of June 2015, there is no soundtrack available for purchase, neither physical nor virtual.
You can buy them on etsy.com
You could probably go on ebay and search adventure time.
Yes, you can get the film and the soundtrack
The duration of Adventure Time is 660.0 seconds.
They are available only at Toys R Us in Australia, but they are really hard to acquire.
Sharpay's Fabulous Adventure - soundtrack - was created in 2010.
Preview, buy, and download Big Time Movie Soundtrack - EP for $5.99. from the itunesapple.com store
You can buy them on etsy.com
You could probably go on ebay and search adventure time.
hot topic
You can go on Craigslist
You can't you have to buy them
You buy it.
Best buy
One can buy the original soundtrack to the 1983 movie Scarface from sources such as Amazon and iTunes. Another company that sells this soundtrack is CD Universe.
You can buy one at hot topic
Online.