Is this a good deal?

My gf has a 2005 Mustang and wants these speakers. I checked the dealer and they do list at $700. Was thinking of bidding $200 on them. Think that would be a good deal if I could win for that?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1,1&item=8011018924&sspagename=STRK%3AMESE%3AIT

Thanks for any input!

I would only go $100 or a little over. Stock bass spearker are OK, but $700 is only because its a dealer item.

Why pay $700 for a set of speakers. You can get aftermarkets that are so much better for cheaper. I did that with my mustang and was quite impressed. If you have the premium sound system in your Mustang I would understand that want for factory, but look up what amps the speakers can handle and go out and get a better after market set. But still only pay like $100 for factory man