I currently have a 2001 mk2 gs 300 with sat nav, which is the most cost effective way of upgrading the DVD ?

I read somewhere that there is a lexus library that you can test the DVD is this correct ?

Also If I become a gold member will I save money if I decide to buy the DVD ?

You cannot test the DVDs. Lexus will loan you CDs so that you can go on holiday to another country. However as the DVD contains all of Europe they will not loan you a disc.

If you become a gold member then some dealers will give you a discount on a new DVD.