Millet is good
It can be found in the bird section of pet stores,whether you're in chain pet stores or not.I know that some of the Tiny Friends Farms treats can be safe but wouldn't be good fed more than a few times a week,but I'd have to get back on exact ones as I will have as many as possible probably around Wednesday.
Stay away from most pet store treats though if you're looking for something to be healthy,as the majority haven't got health benefits and are loaded with sugar and artificial colors and such.