Apparently, there must have been a rash of orders for this collection and Amazon realizing its mistake in the pricing has since corrected it to $46.37 which as others have pointed out, better off buying the books individually.
I did check my Manage My Kindle page and it is still showing as $5.27. So I would strongly suggest if anyone purchased the set for that price, check your invoice once it downloads to ensure Amazon honored that price.
My apologies for any confusion this caused!