Mexican immigrants send 23 billion dollars out of the USA per year (and this figure is increasing over time, obviously).
Higher estimates of the wall's cost put it no greater than 20 billion for the initial construction (Trump himself says it'll cost 10 bil, and I trust a real-estate mogul to know his craft). If you taxed remittances or had a way of stopping them completely, you'd easily pay for the wall just from that.

Actually kicking out illegals and preventing them from coming back would save you over 100 billion dollars per year. If that doesn't pay for a fucking wall I don't know what possibly could.

This sounds like one of those auto-generated news headlines.