Auxiliary Input Boombox How Can You Add An Auxiliary Input To A 2008 Honda Fit?

Can you add an auxiliary input to a 2008 Honda Fit? - auxiliary input boombox how

Hello, I have a 2008 Honda Fit (no sports) and want to add an auxiliary input for an iPod or other connector. I currently use an FM transmitter, but only one socket in the car and I for my GPS. So, if I'm going far from the reception is terrible. Who knows if there is anything I can buy to add auxiliary audio or I can go into a store and do it?
Thank you!