I would agree with everything already mentioned. There are certifying bodies such as NESTA, AFAA and others which are lower cost but if you really want to get ahead in the industry, you get what you pay for.
You will want to have a strong background to deliver high quality services to clients which will in turn create referrals which grow your business and ultimately contribute to your success. We need more legit professionals in the industry! So choose wisely! If you have any other questions about certifications I would be happy to answer them. I wish you the best of luck.