Best purchase EVER

So as a lot of you know, I have a love for Diet Coke.

Sonic Diet Coke to be exact.
(oh how I heart you pebble ice)
Last year I was introduced to the wonderful thing called
"the Sonic window sticker".
The what, you say?

Here it is, in all its glory.
Last year, for a mere $10 you could buy one of these,
and get Route 44 drinks for 99 cents at anytime.
Heaven.
This year.
HELLO HUGE STICKER!It was $20 bucks this year,
still pays for itself in two weeks.
You are only allowed 1 per visit.
But still worth every penny.