Toys R Us will give out 4-card Redakai Metacharged Attack Packs to the first 100 kids that come into each store this Saturday, October 29th, as part of their Halloween Parade Gift Bags.  If we did our math right, that means around 60,000 kids will be sampled. 
Metacharged was released in the hobby in October (see “Metacharged, the First Expansion for Redakai”), and is being released to mass retail on November 1st.