bghydro was running a sale on some smaller carbon filters. I got one, works great, room completely odorless now (and man was it smelly before!). However, you need a decent fan to push (or pull) air through them. Think they have one for like $80 and one for $100 (the sale-priced ones). If the sale is still going on (it was last week).

If you only have one plant though, I don't know that it's worth the expense. I tried some sheets of Bounce on my exhaust port, but that didn't work very well for me with eight plants. Might not be too bad with just one plant though. Home Depot also sells some filters, the big square ones, that say they have activated carbon in them (but it can't be much because they're light). A few layers of that on your exhaust port might help. Those are like $15 or so, if I recall.

I'd get some Bounce sheets and try that first, if I were you, and see how bad the smell gets. Some strains aren't all that stinky, and some are terribly smelly. And one plant, maybe it won't be that big a deal.