Buying a garakei / keitai flip phone

I'm moving to Japan for school soon, I have my visa and now I'm planning what to do for data and calls in Japan. My phone doesn't support e-sim and it seems like my only option is to use a "tourist" service like Mobal. But it seems really overpriced.

I would like to know how much a cheap flip phone (by itself) would cost, that can also provide a hotspot for my smartphone to connect to. (so I can use google maps etc.)

And also how much would it cost if I got it with a data + calling plan?

From what I've seen the local carriers are wayyy cheaper than Mobal. So because I'm staying for a couple years I think the initial cost of the Japanese phone will be worthwhile.

Also the reason I would want a flip phone and not a smart phone is because hopefully the flip phone is cheaper and I also love the aesthetics of Japanese flip phones.

Thanks