@Robert Horton I know this is an old post, but just came across this in my business as well. I am a RE broker in Ca, but I do a lot of flipping and I am not covered with E&O Insurance on any of the deals where I have an ownership interest.
I have found the simple (not free) solution is to have a good business insurance (General Liability) because it covers legal defense and many other things about your business, including injury etc... I would also recommend a good Umbrella policy that can cover you if your General Liability runs out.
Remember, E&O Insurance is really covering the agent and not the flipper. As an example, let's say the agent discloses that the seller/flipper replaced the HVAC. They have done their duty in disclosing this fact. However, if the seller/flipper installed it themselves with no permits and it later caught fire, the liability between the agent and seller/flipper are very different.
It is for this reason, business insurance is a really good idea for house flippers! In my state of CA, it is pretty easy to get sued!