Can you point to a single technical article of any of the advanced contained reactors that mentioned cheap?
Probably not, but I'm also not going to waste a bunch of time looking.
What's cheap? If you pay only $100 a month for electricity that's $24,000 over 20 years. If you have 200 houses in your neighborhood you're looking at $4.8 million.
If you only put these in 100,000 locations at $2 million a pop you are looking at a $200 Billion dollar industry. The only real obstacle I see is government and the people who can afford to buy the government off.