You can get the Flat Stanley Collection Box Set on Amazon right now for only $6.37 shipped (reg. priced at $14.99). It is on sale for $7.50 and when you use code DYTZ8B7A you will get an additional 15% off, making it only $6.37 with FREE shipping from Amazon Prime.
I was excited to see this because my son and I have been reading the Flat Stanley series from the library. He loves it!