I manage 3 kindles with Calibre: mine, my husband's, and my son's. I paid for no ads on my Paperwhite, but husband and son both have the SO versions. Since they rarely turn on their wifi, they don't have the ads, only a small notice on the screen saver to turn on wifi to see the special offers.
So - if you don't like ads on your kindle, but can't afford the extra bucks to turn them off, just never use the wifi on your kindle, and you won't see them after a few weeks or so.
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