Homage to Catalonia and 3 other non-war related books by George Orwell are available today for $1.99 on Kindle.
Homage to Catalonia is an interesting and horrific account of Orwell's service as a volunteer in the Spanish Civil War. I've read it and it is very gripping.
I've read one of the other 3 books in the deal, and it was not good. But Homage shows the seeds of what Orwell experienced and eventually yielded 1984 and Animal Farm.
http://www.amazon.com/gp/product/B003K16PFU/ref=s9_simh_bw_p351_d0_i1?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-2&pf_rd_r=00RRTPKKDYW4PBN6Y05G&pf_rd_t=101&pf_rd_p=1560405502&pf_rd_i=154606011