Bought the Amazon pack of three 5 qt. Castrol GTX full synthetic about a week ago when subscribe and save had it for $60.99. Figured $20.33 for each 5 qt. jug was worth it to me even if they deny the rebate for some reason. If it goes through - then cost per jug is down to basically $17 each...
Another easy way to use a virtual card is just to pay the exact amount on the virtual card toward a larger monthly bill. So perhaps pay a portion of your monthly cell phone or electric bill with the exact amount on the card, then pay the remainder of that outstanding bill using whatever...