I have a 2003 Acura TL Type-S without navigation and would like to know if and where I can get one to put in it.

 

almost any shop that does audio. if u want the stock one than thats gonna be a lot of work with wires and all.

 

forget getting a stock one- the new technology blows away acuras nav
A different radio head and nav screen install is an option. or a portable magellan-tomtom-garmin type device in the $200-500 range depending on how fancy you want

 

Another option is a carputer with USB GPS antenna and double din touchscreen where the stock head unit is.

 

here's my setup, it's a $65 4" GPS bought from staples during a sale. It fits tight in the compartment and doesn't move when I press button/make sharp turns. It has a mp3/4 player with built in FM transmitter. Almost looks factory installed :

 

I use a Palm TX for my GPSin, i picked up the palm a while ago for full price, but the GPS reciever, chargers, cradle, and tom tom software i picked up on ebay new for $60. Works pretty well, but for long trips it can take up to a minute for it calculate the route, I had no problems with accuracy.