Crutchfield offers the Alpine In-Dash CD Receiver, model no. CDE-134HD, for $99.99 with free shipping. That's the lowest total price we could find by $28. It features 18 watts RMS per channel (50 watts peak) into four channels, a built-in HD radio tuner, front-panel USB input, and iPod song tagging.
If you're at least 62 years old, you can score a $10 lifetime pass to America's federal parks and recreational lands. But act quickly because fees are about to jump.