Hate to break it to you, you’re living in a dream world.
Even if you’re going to do all this by yourself, and accepting Paypal payments, PP would still get a cut. If you’re selling via a 3rd-party, they’ll get their cut.
If you’ll be selling this on eBay, eBay will still get their cut (listing/closing/fvf fees) and another cut also from Paypal.
You have to pay if you wanna play.