check this out, there are other packages for sale too...
would it be worth the cost?
i know for a fact those 6.5 inch speakers are for sale at strathfield for $200 a pair.

http://cgi.ebay.com.au/Pioneer-DEH-P4850MP-TS-A1681S-TS-A6981S-3-SETS-1-DEAL_...

From a dedicated car audio forum, here is the advice for buying audio components from ebay:

as with any ebay purchase, it's only smart if:
*you know exactly what you're purchasing
*you know exactly how to install it
*you know exactly how to work it
*you don't want warranty
*you don't want aftersales service
*accept the risks, however small
*have factored in the postage costs, etc