Use your CREDIT CARD to fund the Paypal purchase.
NOT a Debit Card, NOT your bank account.
^ read the above until it sinks in ^
DO NOT link Paypal to your bank account, if it's somehow linked, un-link it right now.
Your Credit Card company will go to bat for you against Paypal, your bank will not.
Most sellers won't take Paypal, because they know they will have a 100% loss from an unscrupulous **buyer**.
If this is a machine you found on a local Craigslist listing, but turns out to be located out of state at a great price - you will get your ass ripped........badly.