Can you get the Nav system installed?
 

So I got everything on my 3 except for Navigation.....Which I really want.....

Can I just...go in and have them install it?(yeah sure, I'd need what...1500 dollars?)

Hey there, QM. No you can not have a navigation system added such as you would get when you buy the deluxe M3 Grande Touring with navigation screen above air vents. I have 3 sport touring, and was also wondering if I could add this, but if it has the nav sys It has to come from the factory off the line. I can't remember where I read this information, it might be on www.mazdausa.com, click on INSIDE MAZDA > FAQ > Mazda3...
However, I did read the info from a credible source, I think its somewhere on that mazda site if not the direction I pointed you in.

QM, its www.mazdausa.com, click INSIDE MAZDA > FAQS > GENERAL FAQS... They won't put a Mazda nav system in.

Ya thats too bad, its a factory installed item. Your only other option i can think off is getting a custom made panel for your radio controls and installing an alpine etc, style nav system. This is not a simple task though and you may find the ol' paper map route to be a more financially sound choice.