I'm about to buy a case on Amazon and I need to add $4.50 to get free shipping. Is there something else that cheap ($5-10, with Super Saver shipping) that I'll want? This FM Xmitter won't fit with my Otterbox case: http://www.amazon.com/Wireless-transmitter-classic-iphone-player/dp/B001CGXM6K/ There's another cheap FM Xmitter, that comes with a cradle and remote but I can't link it because Amazon's database is acting up right now for me. It has highly mixed reviews though. I don't want one that dangles from a cord. Is there anything else I will need?