I have one I have just taken out of my mk2 and replaced it with a Kenwood 1000w sub. If you are interested in buying another, I can sell you my old one?
Fair play. If you're looking round for cheap subs & amps I look on Facebook for the local area 'swap/sell' pages. Got my sub & amp for £30, much cheaper than most Ebay or Gumtree ads.