My husband grew up in a family of 7 and they lived on popcorn. It is such an inexpensive snack to make.
We use the airpopper for popcorn without many calories for my sons' lunches. This has saved us money ... but we primarily did it as a crunchy lunch side for my son who struggles with his weight. This was one of the greatest tips for our son.
Now, when we have it in the evening as a snack, my husband makes it with oil in a pan then adds butter and salt. It is so much better than the store bought microwave popcorn.
.... HOWEVER, one of my husband's vendors gave him popcorn for Christmas and told him to make it with BACON FAT. We tried it ... and it is to DIE for! (But not good for watching your calories

so we won't be having it cooked this way very often!)
One tip I do have ... is the burned popcorn sticks to the bottom of the pot and is so hard to get out ... so, we have one popcorn pot that is for making popcorn.