OK although i haven't done any business with them and they are out of the country here is a site that I found. I have to say that although you want to keep one brand these subs don't look like the ones you want. they are extremely pricey. you can buy other brands for way cheaper that are way better. PM me if you have any questions on a sub to choose.
http://caraudiosecurity.com/shop/product_list.php?manufacturers_id=70