How to get stock navigation on 2007 honda accord?

So 1 mile away from where I live, they got this 07 accord with the EX-L package. The only thing missing is the nav system. Would I be able to buy a stock navigation system through ebay to get it installed? Can I do that? How much do you think it costs to install it? I don't want the aftermarket navigation since it's too slow. I really don't get why honda never makes enough navi models. Any advice?

You obviously haven't a clue about how automobile navigation systems work, but to say that an aftermarket navigation system is "too slow" is a ridiculous statement. It's been my experience after using them for the past 10 years or so, that aftermarket navigation systems like the Garmin Nuvi or similar dash-top navigators work perfectly fine for MOST driving needs. You just have to understand the limitations of the Global Positioning Satellite (GPS) system in general. I like the plug-in dash top nav units better than built-in because they can be moved from one vehicle to another by just unplugging the power cord and mounting it on the next vehicle.