Before you go ahead with the deal, as per @driew's comment, PIA has been bought out by Kape. Read this
3 year subscription plan for $109 (83% off) plus 103% cashback - only new Private Internet Access customers are eligible.
Shopback homepage shows the cashback
Excludes taxes, fees or additional extras
Cashback is only valid for New Private Internet Access Customers
Due to currency fluctuations, discrepancies may apply to the cashback amount you receive. Please note that the purchase amount ShopBack receives is not what your bank charges you, but what Private Internet Access reports back to us in AUD.
Where does it say 103% cashback