the cost depends on what you are looking for.
aluminium alloy cylinder cost more than steel cylinders.
german-made regulators and solenoids cost more that taiwan-made ones.
a lower cost system with steel cylinder and taiwan-made regulator and solenoid may cost around $150 while a german-made system may set you back >$350++
do check around lfs in serangoon north, nature aquarium, system & control engineering, ...
do note that you'll need proper regulator (usually with dual gauges) and needle valve if you want to have precise and consistent co2 flowrate.
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