The National Border Patrol Council, a labor union with over 18,000 members and represents the US Border Patrol, fully endorses congress funding the border wall [1]. It's the solution that the people who are actually there, on the ground, are asking for.
And in terms of money, the American Recovery and Reinvestment Act of 2009 spent $831 billion since it was passed. The border patrol is asking for a pittance of that amount.
[1] https://bpunion.org/featured/why-congress-should-fund-trumps...