Stores that sell Reason refill sound libraries include Musician's Friend, Guitar Center and TheLoopLoft.com, as well as the official Propellerhead Reason refill shop. Guitar Center and Musician's Friend sell refills online and in store, while TheLoopLoft.com and Propellerhead only sell refills online as of 2015.
The official Propellerhead Reason shop includes free refills that are available for download as well as refills for sale. The company only sells refill packs that it produces.
Refill packs from Musician's Friend and Guitar Center generally come on physical discs rather than as downloads. The companies sell refills created by Propellerhead and other companies. TheLoopLoft.com manufactures and sells its own refill libraries.