Most pop-up traffic comes from paid sources, but there are still ways to test the waters without spending money upfront. Some ad networks give bonus credits when you sign up, which can be used to drive traffic. Also, if you have your own website or blog with visitors, you can add pop-ups to promote offers. This won’t cost extra and lets you test what works. Another way is using free landing page builders with pop-up features to collect emails or promote offers. Results may not be fast, but it's a good start. Has anyone here tried low-cost or free methods to get pop traffic?