:/ GCU means gamers club unlocked. Normally $120 for 2 years, BB often sends out special promotions where you can get the subscription for $30 or $60. You save 20% on all new games, various coupons and other promotions as well: https://my.bestbuy.com/gamers/benefits
I got it during through the $30 offer and it was well worth it. Paid for itself several times over since Black Friday and I've still got a year and a half of savings to go.
Disney Infinity Cars expansion pack for $19.99 at Best Buy and maybe you can convince them to match the Toys R us deal. You can possibly get Cars expansion set and Disney Infinity Sorcerer's Apprentice Mickey for $20.98. Alternatively you can have toys r us match the Best Buy deal using Toys R Us price match guarantee and pickup the additional character for $0.99
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