I feel your pain. Been there, done that tells me that it isn't always the printed cost of things--- the "added service" is what may cost you far more. The added cost of getting a body back across the border can cost a few thousand at times.
That's the part nobody mentions when speaking of building a wall. It may not be the cost of building as much as the cost of filing all those pockets along the way. Some of those seem to have no limits?