Walmart offers the Blaupunkt 300-watt 8" Amplified Car Subwoofer for $59.99 with free shipping. That's the lowest price we could find by $38, although most sellers have it for $130 or more. It features variable bass boost up to +18dB, variable input gain control, and thermal short and overload protection.
Vinegar is arguably the most versatile product in your house. If you aren't using it for all of these purposes, you're probably wasting money.