I did something similar. But I got the bigger 20lb tank and a screw-on adapter from Amazon that allows you to refill the mini-tank. Tank 1 cut the refill price in half. I’m on tank 3 or 4 now. The best tip is to go to a true gas shop for exchanges. Most brew shops will exchange your CO2 tank but they mostly stock the kind that lets CO2 gas out of the valve off the top. What you want is the CO2 tank with a siphon or dip tube. It pulls the liquid CO2 off the bottom (without inverting the tank, which is the hack if you have brewery/keg style).
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