So apparently the moto x on republic wireless is the "dvx". The budget moto x. How can it get more budget?
Probably worse screen, lower density battery and 8mp camera.
There is a different Sprint MVNO is running this VOIP/cellular hybrid gimmick, called "TextNOW". Their phone options are IMO better and cheaper. 90 for a Nexus S and 110 for a Galaxy S II.
Their website is disaster though.