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Paypal doesn't do escrow and no seller would supply something without being paid first.
However they do offer buyer protection to cover for non receipt of item or item received but not as described.
BUT that protection is not a 100% coverall so you need to read up on it in paypals user agreement for your country so you can risk assess your transactions.
Its always best if you are not paying a website to ask the seller to send a money request or invoice FULLY DESCRIBING the item you are paying for so that in the event of a dispute for not as described the item is described on the payment checkout notes.