Same experience for me recently.
Costco cross threaded a lug nut, it snapped the stud when I was taking the lug off to put my winters on. They reimbursed me for a new stud thankfuly. I took my car to a GM dealership, they charged $145, that was .8 hours labour, $8 for the new stud. I supplied the new lug. Problem is the guys in the tire bay just use a impact gun set to God knows what torque level. I swear when I was taking the other non cross threaded lugs off they were on much tighter then 100ft pounds, maybe 200 by my guess.