No, $1,564 is the price when bought through US pharma. They're available via the site recommended by https://www.iwantprepnow.co.uk/buy-prep-now for $80. So, presumably the cost is more like $20 or so.
What makes you think this spammy affiliate marketing site is sending you to online pharmacies that will actually send you the drug, rather than take your money and send you nothing?
This "spammy affiliate marketing site" is neither spammy, nor does affiliate marketing. It saves hundreds, if not thousands of lives. Read the linked article.