dear,
I m also doing some research on buying latest DVD for Navigation. make sure you should know your Navigation Generation. u can even download that from various sites. I saw couple ads for Gen2/3 ver7.1 for less than $50 on craiglist. but I couldnt find for my self I have Gen 4. and I m looking for ver7.1. I bought a separate GPS TomTom which works excellent.anyhow
attach is the sheet where u can determine your generation.
LS430
2004-2006
DVD Based System Generation 4
DVD
00230-GEN4S-CY06
Click Here
GS430
2006
GS300
2006
ES300/330
2004-2006
RX330
2005-2006
RX400h
2006
LX470
2004-2006
SC430
2005-2006
GX470
2005-2006
serach on google for best rates. I dont recommend you to spend 250/- ~ 300/- DVD.
also if u can find COPIED DVD it works fine if it burnt on high resolution.
Thanks