Should be available from a smart dealer but price will be high. I’ve seen them on eBay from time-to-time for less than $100 and even on this forum. I believe there is a new version that is larger than the first version.
Weather Tech makes a cell phone holder,that fits several cup holder sizes.May be the solution??................So, I got an OEM one and it doesn't fit my phone. Got an aftermarket one that works....but the smart is sprung so high that the phone vibrates, which is irritating. So I am going the aliexpress tablet head unit route. We shall see if that pans out or not. Still love the smart! Favorite car ever. Too bad it didn't catch on and they left the US market. I hope my battery is still in good order when the lease expires so I can buy it for way less than the residual. And, hopefully the parts network remains in somewhat decent order...