Well, my man and I were wandering through Canadian Tire today and spotted it. It's called "Get Lost Wasp" and is essentially a faux wasp nest in the form of a paper lantern sans light bulb. You hang it 6-8' high and apparently, being territorial creatures, wasps will clear out once they spot it. I hung one from a tree branch close to the deck.
So far, so good, but the real test will be having a meal out here. I'll keep you posted.
[No wasps were killed in the clearing of my deck.]