The What Gives You Goosebumps? contest had a deadline of August 31, 1994 and asked respondents to write what gives you goosebumps in 25 words or less. Winners got their picture, their "monsterized" picture, and story to appear in new Goosebumps books. A total of six winners were selected each month from March 1994 to August 1994. Winners were announced on the back inside cover of Goosebumps books through May 1995.
What Gives You Goosebumps? contest advertised in (at least) books #18-22
December 1994 (book #26) winner
January 1995 (book #27) winner
March 1995 (book #29) winner
April 1995 (book #30) winner
Calendars
1995 Calendar
1996 Calendar
1998 wall calendar and 1998 Scare-a-Day calendar
Fan Clubs
Fan Club ad circa 1995 from book #30
Fan Club ad circa 1996 from book #35
Fan Club ad circa 1997 from book #55
Fan Club circa 1998
Fan Club 2000 ad circa 1998
Collectors Club
Ad for the Collectors Club found in Goosebumps books around 1999.
UK Collectors Club ad (circa 1998)
Merchandise
Backpack (circa 1995)
Games and Puzzles (circa 1996)
TV series/Videos
Video release (with 3D sticker)
Video release (with 'Reading is a Scream' bookmark)