Actually you can blame Apple for the increase in prices; Agency pricing didn't appear until Apple started iBooks and the iPad. Steven Jobs cooked up the whole Agency Pricing scheme with the Bog 6 publishers in order to keep
Amazon from pricing their ebooks cheaper than Apple wanted to.
As for the OP, If you trust your friend, you can register her Kindle on your account long enough for her to read whatever book you want to share. With the newer Kindles, the ebook will disappear off the device as soon as she re-registers back to her account