I used to buy it for $1 and gave it way. Now it's free!

http://www.dontcrack.com/news/2017/10/get-xpand2-for-free-a-dontcrack-exclusive-2/

Also, the $74 for AIR Instrument Expansion Pack 3 Complete is totally worth it. Tons of instruments and sounds.
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"You Shall Know the Truth, and the Truth will set you free." John 8:32