Cost of a Co2 system

[Yenko]

I'm considering pressurized CO2 for a 70 gallon aquarium; I plan to use 160W of flourescent lights. If I rent the bottle how much will the regulator/controller equipment cost me and what stuff should I buy?

 

[Lateral Line]

Not much point me telling you what is available or what it costs here in Denmark, although everything is completely covered with snow at the moment, I suspect you are not here!