Most units are just AM/FM with Bluetooth. CD's are a thing of the past and you can plug in with an AUX cords as well on some. We have a few in stock and can order pretty much anything you might be looking for.
Here are some of the units we carry -
http://www.laceymarine.com/default.php?cPath=6701848_6701888Speakers -
http://www.laceymarine.com/default.php?cPath=6701848_6701908Combos -
http://www.laceymarine.com/default.php?cPath=6701848_6701915If you want something decent with speakers this is a great kit -
http://www.laceymarine.com/product_info.php?cPath=6701848_6701915&products_id=89432569