Yes, the inline fan can be purchased at a hardware store. It will be in the ducting section, if you are thinking of running a chain of fans I would suggest picking up some of that ducting to do so.

As for the lights that you mentioned, I had no clue what they were. Other than the fact that you said they were mercury vapors. From what I know mercury vapors are not good grow lights, the reason escaping me right. None the less, you can go to the light section at your hardware store and pick up some CFL (Compact Flouresent Lights) in packs for a couple of bucks. As well youcan check out the 2' flourescent tubes to add for side lighting. With the combination of both you will have much healthier plants. You may have to spend a little more, but it may be a little extra you are willing to spend if it will be better overall.

The link to your site was dead, I had no idea where to go.

Respect.
G_V :rastasmoke: