I am so sorry for your loss. Our Maine Coon is 15 and not well at all. She vomits most days, she still is adorable and still has some quality of life. I hope you find a breeder and this is kitten season so you any be quite in luck. So sorry for your loss.
Our tabby started vomiting too. The vet diagnosed it as a kidney disease from excessive protein intake. We were advised to feed him Hill’s Prescription Diet Kidney Care Manufactured by Hill’s Pet Nutrition, Inc 1-800-445-5777. You can order 24 cans for $43 at Chewy or 4 lb dry food for $28.99 Our cat is spoiled and only eats the canned food. He is 7 lbs and we give him 1/2 can twice a day.