Im looking for a navi disk but I don't know where to purchase ? I looked on eBay but it's 100$ does anyone know where I can get a copy of it ?

 

I Have a 2004 Acura tl so I suppose the orange disk but which version

 

Acura's website will have a link to the Navteq website for purchase of the most current DVD-- it's version 3.A0 and costs $185+, although there are sales @ $149 at times.

Your other option is to buy a prior version from someone in the Black Market forum here, on e-Bay or Craigslist. Prior versions of the Orange disc are 3.90, 3.80, etc. IIRC, the 2004 had 3.40 originally, but the discs are updated almost every year. The discs also carry updates for your Navi system.
The White discs ('07+)are numbered in a different series and will not work in the '04-'06 TL Navi.

The Orange DVDs are incredibly difficult to duplicate for a number of technical reasons, so I wouldn't suggest trying to use one.

Welcome to AZ.