If you have some of your wanted (but lacking) units, get some replenishable (hordes) and search for a manageable fights (I left some pirates in the Freedom Islands), and use Sacrifice to grow your stacks.
Other than that, elf units (and all the others) seem to be random. I found Lake Fairies in Ellinia in one of the dwellings and Green Dragons in the cave in "thousand rivers" off the coast. I have only bought the initial stock and grown my stack with sacrifice since then.
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