it's their choice of courier for the free ground shipping. When I've ordered I've received from both Canadapost and Purolator. Since they are actually the same distribution company anyway (Purolator is owned by Canada Post) they technically will use the same trucks for long haul ground shipping. Besides computer parts, I also own a company that does mail order and I get a slot of stuff delivered by all the major couriers, none are perfect and all are decent enough if you're insured.