Here is what I do. See something you want, buy a small plastic jar
try it. If you like it order in glass jar. If you find you use it up, buy in bulk, but only enough to fill the glass jar twice or so. Then if it is still favorite you know you have it made and are not wasting money. I do not have a Penzeys near me, but buy on line. I started buying this way, and they always send you a sample or two or three in those small plastic jars. I keep my bulk bags in the bag they come in but bag them again in a freezer bag. Then put them in a drawer nearer the floor and they stay cool and in a dark place and stay fresh for a year or more. I put multiple bags in that same freezer bag, keeping herbs and spices separate. I put a label on the front of the freezer bag telling me what the contents are.