I just checked *Google* and saw a listing for 2/Eclipse #8708.4 8" Subs.
He's asking $125.00 each.I don't know how old the listing is,but it's worth the try/ //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif.
I typed in Want To Buy Eclipse #8708.4 8" Subwoofers.
Their Heading is:Eclipse CD5441 HeadUnit
Hope this helps you.And that the Listing is current/