Farmers yes, grocery stores not anymore. Profits of companies is public info here and they started racking it in the moment the massive ‘inflation’ started. My parents live near a farm and they just buy veggies directly from them for like a fraction of the price, I unfortunately live in a city though. Prices are better at local markets but there arent many of those.
It depends on a lot of things. Something self-hosted would just cost the power and Internet you are already paying for but if you’re renting the hosting and maybe even get development for your site it could cost a ton.