I loved this book. I read it the first time in an Economics class and I would love to buy the Kindle version. There are 4 versions of it listed at different prices. They range from $0.99 to $4.76. The $0.99 is listed as The Jungle by Upton Sinclair. Published by MobileReference (mobi). How do you know which one to buy and can you download a sample of each one?