Nah not much, a bag of feed varies, about 12-16 bucks depending on what you get.
Do you sell eggs? From what I can tell you are younger and live at home with your family? Now is the perfect time to start your own fresh egg business from your ducks or chickens if your parents will let you do that, you can sell hatching eggs and fresh eggs to people who want to eat them, from what I read you keep chickens and ducks? I dont take orders for eggs or anything, I just let friends know when I have some for sale and between my usual 10-12 people that buy them someone will pick them up.
You sound like your head is in the right place so I thought I would mention selling eggs, disregard if you already do that, I only mention it because that is how I help supplement food costs for all my critters.
I have 25 standard chickens ( 14 of which are egg laying aged pullets ) 3 semi grown silkie chickens, 6 baby silkies, about 25 coturnix quail ( plus a bunch of eggs in my incubator right now ) 2 pheasants, 10 pigeons, and an Australian Shepherd lol I know what you mean about food trust me lol. In a week I sell about 4-6 dozen chicken eggs for $1.50 a dozen, and sometimes I sell a couple dozen quail eggs for $2.50 - $3.00 a dozen
I usually only make $6-10 a week from selling the eggs but that is a few more bucks than I would have made if I didnt sell them and $10 will almost buy a bag of feed, if I sell that much every week then that is 3 bags of feed or so I can buy a month just on money from my eggs. When I incubate chicks I also sell a few of them to make up some money but if you are like me you will always drag another critter home lol.
You are very smart for thinking about things before you get them, I commend you on that and we are here for you if you have any questions.