You can use several sites to gain traffic for your CPA offers. But if you want fast result you will need to opt for paid ads to drive traffic fast. If you are not having enough funds, you can go for Social media platforms like Facebook, Instagram, and Twitter are effective. You should create engaging posts and join relevant groups to reach your target audience so that you will drive them to your offer. Reddit is another site that allows you to share your offers in niche subreddits. Quora lets you answer questions and include your CPA links. You can also use SEO to drive organic traffic from search engines to your website or blog. Classified ad sites like Craigslist can help you reach a local audience. The key is to choose platforms where your audience is active.