My 2001 Lexus RX does not have a GPS...I was wondering if it is possible to have one added into the screen. I have seen others like this.

Yes, you can either buy a used or new one and have it installed, or you can purchase an aftermarket model like Pioneer's AVIC-F900bt for under $500, and it plays DVDs and has bluetooth/gps and IPOD hookups. Check it out, you can find demos of them on youtube.