Polysteel Copper is a fairly rare resource spawn. The "Ulafaiium" name is a particular spawn of the resource. Unless it happens that this particular spawn of Ulafaiium is the current Polysteel Copper spawn, the only way you'll find that specific subtype of Polysteel Copper is to locate some of it on a vendor somewhere.
That said, if you're just looking for some good Polysteel Copper (for, say, constructing a lightsaber), you MIGHT be able to find a current spawn on a planet. Anytime you travel to a planet, you can activate a survey device and see a directory showing all the current material spawns on that planet for that general type of resource located by the device (i.e., mineral, chemical, gas, solar, wind, flora). Stats on the resource will vary from spawn to spawn -- for example, Ulafaaium will have different Overall Quality and Unit Toughness et.al. from other occurrences of Polysteel Copper. Once you see it's available on a planet you're on, you then have to go prospecting as normal for a good concentration of it, and to sample it to see if it's worth a damn.