Get rid of old PC’s

I have some ancient stuff that I want to get rid of. I already found a company who accepts old stuff but only complete and functional systems and I have to take care about the shipping. We want to donate them or whatever but not to cause us more trouble. I’m in the Toronto area, if someone knows or have any ideea what shoul we do please let me know. I’m talking basically of some more than 3 years old pentiums, components, monitors but not all of the functional.