Originally Posted by Dutch15
So can I buy from [Amazon], but post their ebooks to another's ereader.
You can, but you'll need to remove the DRM (if any) and convert the format. Unfortunately, you won't find any explicit help with the first of those on Mobileread because of possible legal problems. For the second, converting Mobipocket format ebooks (which is what most Kindle ebooks are) is easy with Calibre. For Topaz format ebooks (which is what most Amazon-only ebooks are) it is possible, but requires more manual tidy-up.