I have a 2007 Toyota Corolla Sport, how do I connect my itouch to the car stereo?

I was looking at the store and the only thing they had was the auxiliary jack thing that you plug into your car but it is expensive. However they have just a cord plug thing too and it's cheaper but if I got that where would I connect the cord with my car if I can't find an input that looks like it's for headphone in my car?
The problem is I can't find any other outlet.
 
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