Once you have prepared your shipment and are ready to send it out, there are a number of places that you can drop off your package(s) and they will vary by carrier.
You can find the closest location to you by visiting the following links:
UPS: https://www.ups.com/dropoff
FedEx: http://www.fedex.com/locate/
CanadaPost: https://www.canadapost.ca/cpotools/apps/fpo/personal/findPostOffice
Purolator: https://www.purolator.com/en/ship-track/find-location.page
Canpar: https://www.canpar.ca/en/ship/drop_off.jsp
Loomis: http://www.loomisexpress.com/DropOffLocs/
DHL: http://international.dhl.ca/en/express/shipping/find_dhl_locations.html
Note: Be sure to take a look at the cutoff time listed at the drop off location if a same day pickup is important. In our experience, we've seen packages picked up 30-45 mins before the cutoff time at the drop off locations so if your package is time sensitive, make sure you drop off your package with some buffer.
