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Wow really, that was it? I've considered purchasing ladybugs (especially after last year's aphid infestation when I brought the tomato plants indoors so they could live longer!).

I also considered purchasing fireflies, but never did. I see a few of them now and again, and it'd be really neat to see more, but -- they need a food source, otherwise they'll go elsewhere. Perhaps that's what happened to yours?

That's a good thing, @briandenver. That means your pest population is low! They will only lay eggs where there's a food source. I released a small cup (800-1000) this year as well. Think I paid $8 for them.