dry food

I am looking to switch my 11-month-old basset girl to a more affordable food. She currently eats Purina pro plan sensitive stomach and skin salmon and rice flavored. At $80 for 24 lbs., it’s just becoming too expensive. She has a chicken allergy so that also makes it difficult. I saw that Purina Pro is a good alternative but, all of their food contains chicken meal or chicken by product. HELP 😫