Merchandising had been a common practice all throughout the 20th century (Raggedy Ann dolls, Felix Kit-Cat Clocks, Dick Tracy decoder rings, Disney everything), but it wasn't until 1977's "Star Wars" that children's merchandising became a whole industry unto itself, so there is only a sparse smattering of Groovie Goolies collectibles on the market -- aside from animation cels, which are abundant and the most affordable.
All of the company's other productions were licensed properties, but "Groovie Goolies" was an original creation that they owned outright, so they were able to reap the (very meager) merchandising rewards. And at that time, it was primarily limited to a few figurines, a coloring book, jigsaw puzzles, and Halloween costumes. In recent years, a few quasi-official bits of merchandising have been released, and there's lots of unofficial stuff available in cyberspace, although demand isn't especially high.
Filmation had a brief taste of success in 1969 as "Sugar, Sugar," a tie-in single from "The Archie Show," topped the Billboard singles chart, and they hoped to replicate that success. The company signed a deal with RCA to pre-release the Groovie Goolies record, banking on it being a monstrous hit. It wasn't one. However, the next year, they did have a hit single with "Chick-a-Boom," which reworked by Goolies singer Dick Monda and issued under his alias "Daddy Dewdrop."
Chemtoy Figurines
Guitar Picks
Halloween Costumes
LB Customz Cars
Monstarz Maquettes
Puzzles