under seat sub woofers

[epsorenson]

hey audio guys,
i'd like to put a sub under the driver/passenger seats.
i've got pretty good clearance under there.
seats are the captains chairs from an 07 escalade.
i think there is at least 3.5 inches or more heighth clearance.

where can i buy one of these set-ups?
don't need the top of the line, just something average.

found this undercover II on line for ~$120 pair...anyone used this?

thanks in advance...