Because you're feeding some of the most expensive grain free foods out there? Core and Canidae GF are way way WAAAAY overpriced for what you are getting.
Yup lol.
I feed grain-free Victor, and I get it for roughly $42 for a 30 pound bag. TOTW has gotten REALLY expensive here lately (over $50/bag, nearing $60/bag). I love, love, love the Victor. I feed the Yukon salmon one, but there are a couple other varieties, including a high protein one (and they do mean HIGH protein - 42%...my dogs didn't do well on that one. Gavroche's BUN levels went up and Logan got super diarrhea on it). They also have a chicken/pork/beef version and a joint health version.
4Health does have a grain-free line now. I haven't tried it yet, but I may get a bag for Gavroche when I run out of food next. Otherwise, I don't rotate anymore because Logan doesn't adjust very quickly, and I can't have him out of work for 4 days every time I get a new bag of food.
I used to get NV Instinct for roughly $38 a bag from sales and coupons at PetCo.