MobiPocket are always the most expensive, because they are the "wholesalers" for all the other Mobi sites, and never undercut them.
FictionWise and BooksOnBoard will generally be within pennies of the Amazon price, but Amazon often discount bestsellers and sell them at a loss - the small retailers can't afford to do that.
If you want to read Mobi books on several devices, your best bet is to get a "genuine" Mobi device such as the CyBook or BeBook. Yes, you can convert Mobi books so that you can read them on the Kindle, but why have the hassle when you can read them directly?
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