Google found me https://turbofuture.com/cell-phones/flip-phones for flip phones, a very recent article, and https://www.lifewire.com/basic-cell-phones-577534 for basic phones. Now you know some models, go and search the shops.
Are you really saying that none of the physical shops near you or webshops in your country sells them?
Or didn't you search?
I remember that years ago my first wireless phone was a flip phone with no camera and no internet connection. Now, I own several phones, my nicest one being an Andriod smartphone that is although quite impressive and fun, like a mini computer, I would like to go ahead and revert back to the old style basic flip phone without all the extra bells and whistles to handle my calls with. Does anyone know if there are any phone companies that offer such a phone these days? If not, if I locate a vintage phone, will a service provider allow me to use it?