We had one of the players stolen, can we get a replacement player?

Hi Christine,
Unfortunately, that's highly unlikely. The players aren't sold separately either as a spare part or otherwise. These units are no longer in production, but there are some for sale on Ebay, new or used. (I'm assuming you are in the US)
New - $279.99 + $15 shipping:http://cgi.ebay.com/270669698423#ht_610wt_1139

Used - $150 + shipping (varies by state)http://cgi.ebay.com/320719137074#ht_500wt_1054

Used - $149.99 + $9.99 shipping (Seller will consider offers)
http://cgi.ebay.com/260820870735#ht_6205wt_1037

The used players seem to be in excellent condition and the accessories are included.
Assuming it was stolen from your car, it's worth investigating whether you can make an insurance claim, but there are usually limitations or exclusions for I.C.E systems, particularly when not permanently fitted to the vehicle. Finally, items like this are sometimes covered by home contents insurance, even when taken outside of the home, so that may be worth checking.
Hope this helps. If I can be of further assistance, please let me know.
Regards,BElectric

Hi
yes and no ? normally they sell it as a set but you can buy a second hand.there is one example here is the link.it will be cheaper than to buy just one screen...you must search more on eBay.there are more.
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http://cgi.ebay.com/9-Twin-Audiovox-PVS72901-Portable-Dvd-Player-/260825621336?pt=DVD_Players_Recorders&hash=item3cba6b2358