The main source for most people's car camping cookware is whatever is the most beat up of their home cookware. Have a frying pan that has become a little warped or a pot that has seen better days, buy something brand new for use at home, and put the old stuff in the camping equipment pile.
Several people have mentioned Aldi's hiking and camping cookware sets. There are pretty good, but they become available only once a year, if you are lucky. There are almost identical sets available online on Ebay at widely differing prices.
https://www.ebay.com.au/itm/Portable-Ca ... rk:20:pf:0But these are okay for 1 or 2 people, but not a group.