In my opinion you don't need marketing yet, you need sales. You have a nearly zero cost channel called the telephone and email (get opt-in first). LinkedIn if it is a B-to-B product. Just start selling it and get a few customers. Build on that, learn from it, sell a few more. Once you have a good product, take happy customers and get referrals and/or testimonials. THEN start marketing via social media. If it's a fantastic consumer product with large potential customer base, you might actually be able to start to grow. If not, you probably need to get $ for marketing ASAP.