The $1OK fee is a "deposit" that is returned when some body else takes over your space at end of "lease." Been to Deming and it's a little barren but VERY nice folks and pretty good facilities. A lot to see in the area, easy access to a nicer area of Mexico.
Escapees park in Livingston is also very nice with full facilities. The Escapee parks from Pahrump, NV across to FL are spaced about 6-8 hours apart on average, very inexpensive camping. Last cross country So Cal to FL stayed at Escapee parks all but 2 nights!
Definitely worth looking into, Yearly dues inexpensive at $75. or thereabouts. All their parks are clean, neat and range from very plush Aguanga, CA to pretty basic in Pahrump, NV. I'm on waiting at Bushnell, FL and Hondo,TX.