One of those little cartridges wouldn't last a day, you need an actual tank and a regulator. I have a small set-up with a 20lb tank, I still need to get it refilled every 7-10 days.

They make a product called CO2 Boost and it is a bucket of organic material connected to a fish tank pump. The material in the bucket gives off CO2 gas and the pump brings it out of the sealed bucket and delivers it to your plant. This is the cheapest most simple way to get CO2 enrichment.