Boy, did you ever stir up memories with this topic!
I, too, remember them well. My mom saved them. My job was to "lick & stick" and fill the books! It's funny the things you remember getting with the stamps. All I can remember and still have is a "deluxe scrabble game set". This was a hard, rotating board that had spaces for the individual tiles. I even still have all the score pegs and the red plastic stands for the tiles, and of course, the gray vinyl bag. It's actually in pretty good shape considering we use it quite a bit and I think we got it in the late 60's. In fact, I think it's in better shape them me....lol!
Also - anybody remember the "treasure chest"coupons?
They were pink with greem lettering, about the size of "monopoly money". We used to get them from a store called "Brand Names", that was a catalogue order store.
I got my first hair dryer - not to be confused with blow-dryer - from them!
Ahhh...those were times!