In Brazil, palm oil is called olio de dende, and can be found in Brazilian food stores. In Cuba, palm oil is referred to as manteca de corojo and can be found in Hispanic markets. There are also players who prefer plain old Vaseline. You will need to experiment to find out what works best for your skin. Calluses also need to be groomed.
Some players use a pumice stone after a shower or bath to file down their calluses.
Others prefer an emery board. What you use is not important. What is important, is keeping your calluses under control. Pay close attention to the calluses, especially the ones at the first knuckle on your index fingers. Another problem with calluses is they can split.