Wisconsin's Waukesha County was jolted earlier this year when two 12-year-old girls allegedly stabbed a classmate because they thought it would please a fictional character known as Slender Man. Now, some local stores are catching flak for selling Slender Man costumes in time for Halloween, reports the Milwaukee Journal Sentinel. At least two stores had the costumes available for about $40, reports Fox6 Now, which rounds up reaction from appalled Waukesha residents. "The girl’s finally back in school and feeling good, and I just think this would set her back,” says one, referring to the victim, who survived the attack. Neither store plans to drop the costume, reports WISN. (A young teen in Florida blamed Slender Man for driving her to set her home on fire.)