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You can buy a phone like that, they are usually advertised for rural use edit: or you can make one http://zerophone.org/ which also has plans to crowdfund some pre-built phones
I'd love to, but as someone who has spent a lot of time looking recently, it's certainly not easy to find anything suitable here in the UK. You can get dumbphones, but getting a good dumbphone, with reliable reception and decent battery life, is a different question altogether. If you want anything at all beyond basic features, like say a dual SIM option for use when travelling, you're straight into high-end smartpho…
My $20 Wiko Lubi has dual SIM. Never had problems with its reception or battery life, either. Audio quality, on the other hand...