Get your Supercheap Auto membership for a $1 and get $10 store credit. You need an email address and a phone number to apply. $10 credit is added to your account after you activate your account via email. You don't need a membership card in-store, just give them your phone number/email at the checkout.
edit: Pay for your membership online with a Credit Card or Paypal or do it in-store with cash. From FAQ - $10 Loyalty credit from joining is valid for 56 days. Membership doesn't expire / no renew cost.
*Check their prices online first if you're going to a store. The one I went to had the normal price tag instead of the discounted price, but I was charged the discounted price at the checkout.