Hill's Prescription Diet z/d Food Sensitivities - cat dry food

My cat has had allergies for a few years now, and when I found this food, it was the best solution! Of course, along with his monthly vaccine, which he never misses... What I’ve noticed is that every time I buy (and it’s not a small amount...), I’ve been able to compare and see that year after year, the price goes up by €10 each time!! What madness is this? At what price can we keep feeding our beloved companions? I know things are tough, because prices keep rising, but this just seems unbelievable to me!!

kibble for a cat with IBD, I usually give ZD canned food, but I added this kibble because my cat started having diarrhoea again