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 smartphone territory, even if you actually have no interest in the so-called smart parts of the device.
Dual (or even triple, and I've seen 4 and 5 too) SIMs is pretty much standard on phones, dumb or smart, intended for the Asia market, mostly produced by various small companies based on the standard Mediatek platform, but you can buy those online.
edit: or you can make one http://zerophone.org/ which also has plans to crowdfund some pre-built phones