you're joking right?Go on ebay mate, and look for a shop called theloudest.co.uk.... they sell really decent gear they make themselves..
On ebay all there stuff is discounted for some reason, get their 3000w amp and wiring kit together to power the sub let me find you a link...
http://cgi.ebay.co.uk/Amp-Deal-2-30...hZ017QQcategoryZ14942QQtcZphotoQQcmdZViewItem
i can vouch for their gear its amazing quality, look forward to hearing what you think...
Fair enough then...
IMO you pay for what you get so if this kid wants this sub kicking he's got to pay the big money for the equipment to power it...