I make my own every year... other than that, just buy Grape Jelly at a grocery store. Marmalade works well too. Provide suet for Orioles too.... I usually hollow some of the pulp from 1/2 an orange, squish it on top of 3/4 block of suet in a suet cage and fill it with jelly. I also do not use orange slices, but hang whole oranges or 1/2 oranges using the hangers that come with hanging plant baskets [which I normally remove from the baskets and replant in larger containers].
It doesn't have to be organic, Andrew.