My bath faucet hot water side started dripping. After checking the house water pressure I figured it was a bad cartridge. After some research (old purchase) I found the model and a $30 cartridge from the company. Further research found the part for about $18 with Amazon free shipping.
One of the bought frequently with items was a spring/washer set. The comments on that item indicated that it was frequently the cause of leaks in this faucet. I figured, why not try the washers first. The shipping on the $5 part was not free. A quick search identified it at Home Depot for the same price. I did buy online and reserve for pickup. Unfortunately, local Home Depot wasn't ready within 2 hours and I had to help them find the part when I arrived at the store.
Oh, the replacement washer stopped the drip, it was a 5 minute repair.