Raceface Chesters have a good reputation (real world results or marketing who knows...) and cost $50:
https://www.amazon.com/dp/B018J1J7QE/

Personally though...I've used many pairs of flat pedals and the most comfortable pedals I've used are Dmr Vaults:
https://www.amazon.com/DMR-Vault-ped...dp/B004NOHZXE/

At $133, plus $16 for black pins:
https://www.amazon.com/Flip-Vault-Pe...dp/B00G6GG1F0/

They were not remotely cheap. I held onto the box etc when I bought them because I thought I might return them. Instead they turned out to be the most comfortable bike pedals I've ever used. I'm more comfortable on my bike than I am walking around in my regular shoes.

It looks like they released a new version of the pedal that doesn't have weird colored pins but at the moment it's only available in the UK:
https://www.amazon.co.uk/Dmr-DMR-Vau...dp/B07G3GN9B7/