FrugalMechanic was a comparison shopping site for automotive parts that operated from 2008 to ~2019. It was run by (@tpunder) and (@er1c). The domain expired and was taken over by a spammer so I won't reference it here.
Here are some examples of what it looked like originally via the Internet Archive:
I (@tpunder) have moved all of the old Frugal Mechanic open source over to my personal GitHub account: