Finding Sales Comps Online

[Graham Harvey]

I know that an agent or a broker generally won't have a problem doing a CMA or finding comparable sales for clients, but let's say that as an investor you wanted to quickly find comps online yourself. What tools would you use to do that? The big websites like Zillow and Trulia have recent sales to look at, but I'm finding that those can often be old or seem incorrect (i.e. million dollar home sold on a $150k street).

There are several websites out there that claim to provide accurate sales comps, such as PropStream, REIPro, RealeFlow, REI/kit, and others. Are those tools generally accurate? Which ones are your favorites?