At level 88 there's full sets of green gear on vendors, one of them at Longyin Outpost in Townlong that is 408. Replacing some of your pieces that are basically level 85 gear should go a long way, because if you're questing as prot, or not questing at all, you really aren't going to get holy gear any other way.
If you want gear from questing for holy, make sure you're changing your spec before you talk to the NPC to turn quests in.
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