Anyway, I did a google search for 2012 on the topic and located an article on Fox Latino from that year about Cruz, which said:
Cruz also distinguished himself from Dewhurst with his full-throated support for a border wall estimated by the Department of Homeland Security to cost $7.3 billion, or $6.5 million per mile.
This encourages me. But his supporters do not. But I give you kudos for at least trying to give information.
Go, Cruz, GO!!