You skip the traditional back-and-forth negotiation because prices are pre-negotiated between Costco and the dealer.
Costco partners with specific "authorized dealer contacts" who are trained to handle member-only pricing sheets. is costco car buying program worth it
Members receive 15% off parts, service, and accessories (up to $500 per visit) at participating service centers, even if they didn't buy their car through the program. is costco car buying program worth it