Purchased last week from WalMart online:
5-quart jug Mobil 1 5w30 for Tacoma, $22.88 plus tax, minus $10 Mobil annual rebate, $14.77 total cost.
5-quart jug Mobil 1 10w30 for Corvette, $22.88 plus tax, minus $10 Mobil annual rebate, $14.77 total cost.
2 x 4-quart jug Shell Rotella T4 15w40 for dirt bikes, $13.48 each plus tax (no rebate but still that's a good price).