A cheap way to add CO2 to a small space is with a CO2 Boost bucket. I'm gonna catch hell for saying that,(((( but before you other guys hammer me, remember he has a small space here)))....but they DO work in small spaces wambam, just not enough for a very large space such as a conventional grow room.
There are better ways to supplement CO2, but they cost considerably more, and take up more space.
P.S. If you can leave the door open during lights-on, then the CO2 becomes much less of a necessity. I grow in a large cabinet and do not supplement CO2. Not because I couldn't...but I just don't absolutely need it. I subscribe to the K.I.S.S. principle myself when it comes to CO2.
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