i have googled and everybody wants to sell them, they give no quantity amounts, just a price.. that is just too stupid for me to bite. (3 different stores). i guess we could just press some baking soda into a pill and use vinegar? i have seen wholesale co2 pads for vegetables and meat.. i have also seen those same things in hydro stores 1,000% marked up from the grocery store supply stores. they have 3 / 5 gallon buckets you use a piece of bread with, tubing to spread out the co2... all so much cheaper and cooler than other ways. co2 booster bucket looks like a rip, over 100 bucks? you can always just burn a gas burner in grow room during off light hours if the room needs heat? babbling but all good info. good luck