Are you buying those fattening Microwave Popcorn packages or are you still in the dark ages uses an Air PopCorn Machine! Throw away that one use wonder!
Use your Microwave!
Take a medium lunch bag put in 1/4 cup of popcorn of your choice fold top part of bag about a 1/4 inch a few times over(don't want any kernals to pop out!) then depending on your microwave (mine is 1000 watts) cook on high for 90 seconds. Works great, cheap and healthy! Do watch your first few batches as each microwave is different.