As one of its daily deals, THAT Daily Deal offers an AFC or NFC Champs 13" x 17" Wall Cling in Seattle or Denver, bundled with an XLVII Champs Wall Cling, for $19.99 with free shipping. That's $30 off list and the lowest total price we could find. Deal ends January 22.
Of note, it's available as a larger 26" x 35" version for $29.98.
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.