You can do this yourself (you can Google for how-to). The process of stripping Kindle DRM-MOBI format and converting it into ePUB is about as simple as ripping a DVD.
My bank (UBS - it was called Swissbank at the time) ended up buying thousands of NeXT systems during the nineties. We used them for everything - desktops, servers, developement platform. As a desktop - NeXT step was years ahead of the alternatives available at the time (Windows 3.x). I remember logging into my NeXT machine every day and thinking "wow - that's what the computing of the future will be like". At one point, we stopped buying "real" black NeXT systems, and started putting NeXT x86 onto white Compaq computers. Then Windows 95 came along, and the rest was history..
We still have a bunch of old NeXT cubes gathering dust in a store room. I wonder what they would fetch on eBay these days..