Basically, you can find a house in any price range you want in the greater Managua area. I have a friend who lives in a house of about 500 square feet that cost her in the US $20K range. I have seen new construction advertised at 90 square meters (just over 1000 square feet) in the $50K range. Houses in my neighborhood range from the $60's to the $150's.
Another factor is how much land you are getting with the house. Land here is sold by the vara cuadrata. One vara cuadrata is about 7.5 square feet. BUT houses are sold using metric measurements. So it can get confusing at times. Also, most houses here are only plumbed for cold water. Having hot water plumbing is extra (and if you are my age, you appreciate warm rather than cold showers in the AM.)