Kyocera Duraxt
https://help.ting.com/entries/22567167-Bring-Your-Sp ... »
I don't think it's on the white list, but their tech support is actually TECH-savvy and they will help look for work-arounds to make stuff go for you.
Of course, this is completely dependent on the assumption that Sprint's towers provide adequate service in your area. I can't speak for that.