Hey Yesum. Here's some data on the carbon you want:
We’re looking for 4x8 vapor phase Coconut.
Carbon Activated Corp sells 55 lbs, 2 cu. Ft. for $95 + $45 for UPS
Buy Activated Charcoal is a lot more.
TIGG is also a lot more.
That is one BIG bag of carbon. Keep in bag and it's good for years and years.
Hope that helps!