Show him some links:
http://www.sonicelectronix.com/item_3217.html
http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=14469
http://woofersetc.com/index.cfm?fuseaction=product.display&product_id=3083
http://www.millionbuy.com/apnspx177r.html
http://cgi.ebay.com/BRAND-NEW-ALPINE-SPX-177R-6-5-COMPONENT-SPEAKER-2-WAY_W0QQitemZ110064926273QQihZ001QQcategoryZ32819QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ALPINE-SPX-177R-6-5-6-1-2-TYPE-X-COMPONENT-SPEAKERS_W0QQitemZ140063821125QQihZ004QQcategoryZ58030QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ALPINE-SPX-177R-Components-2-Way-6-5-Speakers-NEW_W0QQitemZ250054262029QQihZ015QQcategoryZ32819QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
....and offer him $200-255 for them.
The only thing I can see about buying them from your friend is that you'll get them instantly.
http://www.sonicelectronix.com/item_3217.html
http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=14469
http://woofersetc.com/index.cfm?fuseaction=product.display&product_id=3083
http://www.millionbuy.com/apnspx177r.html
http://cgi.ebay.com/BRAND-NEW-ALPINE-SPX-177R-6-5-COMPONENT-SPEAKER-2-WAY_W0QQitemZ110064926273QQihZ001QQcategoryZ32819QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ALPINE-SPX-177R-6-5-6-1-2-TYPE-X-COMPONENT-SPEAKERS_W0QQitemZ140063821125QQihZ004QQcategoryZ58030QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ALPINE-SPX-177R-Components-2-Way-6-5-Speakers-NEW_W0QQitemZ250054262029QQihZ015QQcategoryZ32819QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
....and offer him $200-255 for them.
The only thing I can see about buying them from your friend is that you'll get them instantly.