This deal has ended.
Amazon has the Kensington 33199 iPod Charger & Digital FM Transmitter in black for $46.98 after a $10 mail-in rebate valid through 7/30. This is $60-$70 at most stores. Shipping is free and there is no sales tax (except KS, ND, WA). This charges your iPod and transmits it through your car's FM radio. Though many similar products have mediocre reviews, this is rated 4 of 5 by over 150 buyers.