[Bring_Back_Shantz]

Yes, you most certainly can convert most BBQs but it usually means replacing the burner.

As for making the change, I'm not sure which is cheaper but I'll tell you this, Propane will do a better job when it is cold/windy as it will put out more heat than natural gas. I think that is part of the conversion (they put through more gas to make up for the lower heating value of methane vs propane), but I've found that on days where it is particuarily cold or windy you may have some problems where has with a propane rig you'd probalby be okay. Of course if it's too cold you'll never get the propane to light, but you probably won't be BBQing in those temeratures anyway.

My two cents.