The only cat food our girl will eat is Aldi Vitacat - the dry one. It's not always available so I've tried buying other brands but she won't touch anything else except sometimes Iams.
This week though she has started refusing her Vitacat - I think the pellets look a bit darker than before so suspect they've changed the recipe (grrrr!!) has anyone else noticed this? She keeps sniffing the food in her bowl and walking away confused and 
It's not so much a cost issue for me - just that the nearby shops don't sell Iams. Dragging myself out to the big supermarket now.
She doesn't seem unwell and isn't being fed elsewhere - she's clearly hungry.