For three days only from October 19-21, Five Below will have LEGO Dimensions on sale at $5 for 2. Each of these Fun Packs are normally priced at $11.9 each. Pretty good when you get it just for the minifigure at $2.5 each considering that LEGO Collectable Minifigures Series are priced at $3.99 each. Note that you must purchase two LEGO Dimensions packs in order to get the deal.
Available in-stores or online. However, you will have to pay for shipping if you purchase online. Thanks to atmail35 for the tip!