Well the good news is before you activate the legacies these items only cost 1,550 gp and 1,500 gp. That is because without activating the legacies they appear as simple magic items.
- The Divine Spark only appears to be a Holy Symbol of Resistance that gives you a limited form of tongues (other people understand you, but you may not understand them)
- The Holy Symbol of Ravenkind appears to be a Phylactery of Faithfulness (detects when an action may cause a change of alignment or piss off his diety).
The problem is your DM must give you these items, if he doesn't want you to have them you simply can't have them since these items are "unique."
You could also create your own legacy item, but once again the DM must allow you to do so.