There is a fee for sellers, but this is comparable to what you'd pay if you were to set up an online shop and get a bank to process credit and debit card payments. What's great is that there are no set up costs or monthly fees involved with PayPal and you may also get Seller Protection at no extra cost, to protect you against potential losses due to buyer claims.
Here are the standard fees for sellers receiving payments in Australia:
Monthly transaction volume
Price per transaction
AU $0.00 - $5,000 (base rate)
2.4% + AU $0.30
AU $5,000.01 - $15,000
2.0% + AU $0.30
AU $15,000.01 - $150,000
1.5% + AU $0.30
AU $150,000
1.1% + AU $0.30