Save your money folks. We just use a saucepan. Put oil in the bottom, just enough to thinly coat the bottom. Sprinkle salt in the oil if you want to. Put enough popcorn in the bottom so it sticks to the light oil coating in one, single layer. (No measuring!) Then use a lid, or for even more retro excitement, cover with a dome of aluminum foil a la jiffy pop! Cook on medium heat and once they start popping, just jiggle the pot so they don't burn. 3 minutes later-great old fashioned popcorn.
I like to dump the popcorn into a bowl, salt right away and use the still steaming pan to melt the butter. Then we pour that on top, shake to distribute and curl up on the couch for re-runs of The Brady Bunch!