Hello bob2154,
Well, best and cheapest are mutually exclusive.
The best way would be to replace the head unit with perhaps the newer JVC KD-DV5400 which does have an aux input on the front. If you order from Crutchfield and use my referral number, you'll save $20 and shipping is free.
www.crutchfield.com
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If you want the cheapest way, I recommend using an iPod FM adapter. Here's a link to buy.com which sells the Belkin F8Z075 fro $37.49 plus shipping.
http://www.buy.com/retail/product.asp?sku=202494906&listingid=37031845&dcaid=17902
Most older head units cannot directly translate the data from MP3/MP4's so your head unit will probably display something like "UNKNOWN TITLE".
Hope this helps.
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