Various freeibies were included in Shogakukan’s Second Grader Magazine. For playing cards please see here.

 

Mini catalog (ミニカタログ)

 

Mini notebook（ミニノート). Included in the July 1987 issue.

 

Stickers noted as being freebies in the June issue, year presumed to be 1987.

 

There were also paper houses you could assemble included in the magazine. I have also seen some kind of Taiwanese version of these that appear to have been sold over there.

 

Here is an example of one of these in Youchien (幼稚園) magazine.