Most pieces are selling today for $200 or more, depending on the size and rarity of the piece. Many avid collectors consider these items "highly sought-after", and it is especially rare to find one is such good condition, with no breaks or cracks in it after almost 80 years.
The plate measures approximately 5.5" across, and the cup measures approximately 2.75" tall and wide (not including the dark blue handle).
The other photos show various other cup & saucer sets that I also have for sale on Craig's List as well.