animal prescriptions in nogales, sonora

hey there everyone! my senior dog just got diagnosed with cushing's disease and the medication is super expensive here in the us. i live close to the nogales border and have gotten medication there before at a much more reasonable price than in the us. has anyone been able to purchase vetoryl in nogales, sonora? if yes, from where and how much did it cost for your dog's dose? thank you in advance for any input you might have to offer!