Used cars are a real crap shoot and there is very little "applies to all" advice I personally can give. I would say that have any used car looked at by both a mechanic and a body shop and get a CarFax check done.
Edmunds states that there are always legitimate advertising and other fees that they do not include because they vary from region to region.
Carsdirect.com is usually competitive, depending on the model and region. Like I said, it should be used as just another bargaining tool.
TMV is simply a target price that indicates a fair price for both you and the dealer. It is by no means the lowest possible selling price. As for TMV prices being below invoice, I am not sure which cars you are looking at, but right now many makes and models have extra cash incentives on them. This will allow dealers to sell a car below what the factory invoice states, as I am sure you know. Even popular cars like the Honda Accord have over $1000 in incentives on them.
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