Take a tolerance break. If you find something else it will just raise your tolerance even more, and even if you find something that may be cheaper (prices vary by region and source, so no way on knowing what would be a cheaper alternative) at first, you will soon be paying the same amount as you are now.
Take a few weeks off, and if you still want to use, keep your use to 2x max per week, and don't use on consecutive days.
This is a harm reduction site, so "what should I take to get high" doesn't really fall into that realm. It's for help in minimizing the risks that come with taking drugs, not for telling you what drugs you should take to get high.