Recycling a PC generally costs money, which is unpleasant. It seems like you shouldn't be punished for trying to do the right thing.
Fortunately, there are an increasing number of stores and companies that will accept old computers, monitors, and other so-called "e-waste."
Here is a link to the City of Denver Government website, listing local companies accepting e-waste .
And here is a link to the same website, where they list recycling drives , held a few times each year, where companies like Dell sponsor large-scale events where you can bring lots of electronics to be recycled, either for free, or at a very low cost.