Simplify the following text for a Grade 13 native English-speaking person.
Original: Parental battles , arguments , and fights increased rapidly as supplies dwindled , and when retail supplies ran out , parents turned to the Internet , where Furbies could be purchased for two , three , or more multiples of their retail price .
Simplified: Parent battles , arguments , and fights grew higher at the popularity of them , and when retail supplies ran out , parents turned to the Internet , where Furbies could be purchased for two , three , or more multiples of their retail price .