The up and coming mechanism for marketing and providing solar lighting systems is a lease model with M2M control for gradual repayment (eg M-Kopa and Azuri Paygo). There is no reason this would not work for solar electric cooking modules.
If by 2020, the price was $180, then households could substitute the US$8 per month they pay for kerosene, charcoal, biomass and even LPG to pay over a 2 year period, owning the equipment at the end. We note that Ref 2 refers to a lighting system of 20Watts installed in Bangladesh for 150 Euros (US$200). This seems to support our proposition that people would be willing to invest $200 for energy through microfinance. (However it also suggests that in 2012 100Watts installed in Bangladesh was in the region of $800 allowing for some economies of scale.)