Yes, this canadavisa site. Ask your questions, and get free responses from multiple sources.
It will be the same quality of answers (or perhaps better) compared to any "professional" free advice you can get elsewhere. Remember that you get what you pay for... there are enough stories here of people paying thousands of dollars to lawyers and consultants and still getting bad/wrong advice, I can only imagine what the people offering their services for free or a reduced rate will give.