When Time to Play predicted the season's most popular toys, a few offerings from the Monster High line of horror-inspired dolls made the list. And sure enough, the dolls seem to be awfully popular this season: FreePriceAlerts tells us that a two-pack gift set consisting of the Werecat Sisters (that's Melowdy and Purrsephone, for those unfamiliar) is one of its five most popular toys this week. The dolls vary in price -- the Werecat Sister pack is $54 at Amazon, while Frankie Stein sells for $20 at Walmart. They are intended for ages 6 and up.