Rowling has written another book (The Tales of Beedle the Bard) and two supplemental pieces (Fantastic Beasts and Quidditch though the Ages) in the Harry Potter universe. She has stated in interviews that she has other projects in the works, but so far we haven't seen anything of them. For bargain prices, I would recommend hunting through used and discount bookstores such as Powell's.
New, Overstock. Com has the paperback box set for $50 and Scholastic has it listed for $42. (I didn't do much price comparison searching.).
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.