Eminence Legend BP102-8

Of course there's no free lunch in audio, it goes low but isn't very loud and needs a mid speaker 'cause its frequency response isn't widest. But if you know how to use it, it's a great woofer. Quality build, quality sound. Not light, as you'd expect from a ceramic magnet woofer.
Stick 4 of these in a cab with a good mid driver and you can have a huge sounding bass cab for not too much money.