Based on this question: Do Tefilin need to be painted with "special" ink?
Based on the answers, we know that the paint used on the retzuah must be derived from kosher animals (or plants and synthetics). It may not be derived from un-kosher animals (e.g. pig, elephant, camel, et c.).
Taking this into account, are there any shoe polishes (which can be used to blacken tefillin) which are made only from acceptable ingredients which are available in the Eastern US?