As for cost, I haven't seen a dual burner Coleman PerfectFlow at $34 USD. That's ~1/2 the price of dual burners in that line and it looks fairly simple (that's a good thing).
Thanks for the info. These single burners look good at $34 USD. I need to check again -- maybe prices have dropped, or maybe it's a pricing quirk up here (last time I checked locally, they wanted over $50 CAD).