Mattel, producer of popular brands like Barbie, Hot Wheels and Fisher-Price, announced during the company's second-quarter earnings call that it's raising prices in the second half of the year leading up to the holiday season to offset the rising cost of production and shipping. Hasbro, whose brands include Playskool, Nerf, My Little Pony and Transformers, also announced possible plans to raise prices for toys and games in time for the holiday season. While retailers have been preparing throughout much of the year, possible shortages in inventory due to high demand for toys could outweigh supply capabilities. MGA Entertainment, the maker of L.O.L Surprise, only has enough inventory to fill 65% of its pending orders. Toys that sell out quickly could also take much longer to be replaced by new inventory. So if you're hoping to grab this year's popular toys, you'll need to act fast.