Your comments

The level of the price is something you are in the best position to evaluate, but I heartily agree that the need to starts steps towards the purchase process before learning at least the price range creates suspicion and possibly distrust. Do you really feel that advising the price as in the range of ($x to $y depending on your local taxes) will stop people proceeding?

Saying that the email will not be stored does not help anyone uncertain that the claim is true, so does not help anyone feeling uncertain by the lack of any indication of the pricing at all.  Creating the feeling the process is being secretive is not helped by statements of 'do not worry, we are good guys'.