I want to put together a Co2 system for my 55 gallon tank. I am wanting to do a pressurized Co2 system that I am able to turn on and off with the aquarium lighting.

1. Is there a good kit that contains everything I need that isn't too expensive yet made of good quality components?

2. If I decided to buy the parts individually and put together my own system. What exactly do I need? best brands/model/type links appreciated. Specifically I get credits to spend on grainger.com for items from time to time can i get anything from that website that would work? I just don't know enough to sort out exactly what to buy on my own.

My goal is to have a Co2 system for my tank that works well and doesn't cost more then $150-$200. Would love to stay under $100.