 Numerous spin-off series were written by Stine, including "Goosebumps Series 2000" (published from 1998 to 2000), "Goosebumps Gold" (which was never released), "Give Yourself Goosebumps" (1995 to 2000), "Goosebumps HorrorLand" (2008 to 2012) and "Goosebumps Most Wanted" (2012 to 2016).More than 400 million "Goosebumps" books have been sold, making it the best-selling series of all time for several years.At one point, "Goosebumps" sold 4 million books a month.