This disc was originally a Walmart exclusive bonus item. I'm not sure if it was sold separately then or given away with the album.
The musical content makes it a worthwhile purchase, but I agree the price asked is too high. Hopefully if Yeah! ever gets a deluxe reissue all this material (and the various other bonus songs from various sources - for which see the album's Wiki page - will be included on a second disc.
When I bought the main album I sought out a copy sold through another U.S. store, Best Buy, which has bonuses of a live version of No Matter What, and a cover of Lindisfarne's Winter Song.