No vendors/stores are supposed to pay the transaction fee unless its for a personal transaction in which case you can select who pays the fee.
Its actually against Paypals T&C to make the buyer pay a surcharge but some stores do it anyway.
Quote:
Obligations when receiving funds
11.2 If you receive funds through our Services you must:
- Pay any applicable fees for receiving the funds into your account;
- Not ask the buyer to send you the payment through a Personal Transaction if you sell goods or services; and
- Not impose a surcharge or any other fee for accepting our Services as a payment method.
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https://www.paypal.com/au/webapps/mp...eceiving_funds