In Puno, South of our country, this doll, the Ekeko, is part of a huge group of beliefs. In a variable date in May or before there are days where the people climb the main hill (it's called Apu). This hill is sacred and the main character is this Ekeko.
The meaning of this popular party (even far more popular than the catholic celebrations) is about desires...
The people climb this hill, this Apu, and drink a lot of beer, which first glass has to be spill (just a bit) to the Mother Earth (Pachamama) and the people sell and built every desire that someone can imagine: for example little houses of glass (5 inches tall), little trucks cars or motorbikes, small papers that duplicate the form of the money, universitary degrees, little bags (2 inchesx1inch) of food as rice, etcetera. With the prosperity today there are also big things as buildings of 10 stores (20 inch of height); the most rustic desires are small homes of rock, built by the own hand.
The Ekeko is at the center, it means the main desire, the first desaire, the ultimate desire that includes every and all desires: prosperity, love, wealth, food, etcetera.
In Lima I suppose that it is sold in Larcomar. In Arequipa the Patio del Ekeko, besides the restaurant and textiles has artistic Ekekos, in Puno and East of Bolivia they are in markets of handicrafts.