There should be..ask Google ...bananas, baked potatoes, I know are great sources...I can't think of what else right now. Medline should be able to tell you..any search site
Foods with no potassium
A good source of information would be those sites that relate to people on dialisis. People on dailisis are also restricted on potassium intake along with several other things that build up in the blood. I would imagine that by following a diet for those on dialisis would help you imensly but may be difficult to follow. But one thing in your favor is that many people are there so use the support groups to assist as well.