Are after-market back-up cameras available for less than the $700+ the dealer charges?
Yes and Google is your friend or any after market auto shop. Even Best Buy and JC Whitney.
Yes
Thank you very much, Volvo V70. I ordered one from Amazon. Now I just have to find someone closer than 30 miles away to install it for me 
Dianne Felder
Virus-free.
www.avast.com