Here is another PayPal promotion. Spend $20 or more at BigW Entertainment site and you can get $5 off. Not really sure about the expiry date, but as it is a Father's Day promotion, I assume that it expires on 2 September.
BigW Entertainment will send you a $5 voucher once the transaction has been completed with PayPal so you can redeem it. Too bad that regular BigW can't take money from your PayPal account.