Many people are reporting that they cannot get an immigrant visa interview at the U.S Consulate in Ciudad Juarez, Mexico.
Please note that the consulate is apparently only scheduling interviews in small blocks. So, you may find that no appointments are available online at http://ais.usvisa-info.com/en-mx/iv or by calling 1 (703) 249-4628.
My office checks daily for appointment availability. Blocks of appointments may open up to only disappear within a few hours. Appointments, when available, seem to be for approximately two weeks in advance. Please note that calls seem to be the best way to schedule IV appointments at this time.