Just get the cable from
http://www.discountcarstereo.com/detail.aspx?ID=1467 and do the install yourself in 30 mins.
No soldering required. Just remove the radio (you'll have to get the radio removal keys online $5) and plug the cable into the open connector for the CD changer on the rear of the radio. Then attach the power wire on the cable to the power antenna wire using the included clip using a pair of pliers.
Then route the cable down the back of the center console and either drilll a small hole in one of the center shelves or keep going to the ashtray area and exit there. Just depends on where you want the cable.
Re-install radio. Select AUX in (how to do this is part of the instructions) and your're up and running.
Full installation instructions are included with the cable. If you need more help, full instructions with pics can be found online at the Pelican Parts site.