Flintstones Valentines?

When I was a kid, there were lots of Peanuts and Boynton greeting cards, so I wonder if there were Flintstones greeting cards when that show was on Prime Time. And if so, did the valentines say stuff like: “You Rock!”, “You’re My Yabba-Dabba Dude!”, and “You Make My Heart Go: 'Bam Bam'!”?