kids old puzzles

I have a set of six puzzles. They are H-G Toys Company. All the pieces are there and they are in good/used condition. They are: Hansel and Gretel, Pied Piper, Wizard of Oz, Rumpelstiltskin, Snow White and Sleeping Beauty. They are 75 piece puzzles. Three are round and 3 are rectangular. Are they worth anything and if so where do I take/send them? Any help is appreciated.