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The biggest expense with a grey parrot is quality food, vet care, and environmental enrichment. You're talking about a bird that lives 40, 50 years easily, so it's a serious commitment. Proper parrot pellets are expensive - around 200 to 400 reais a month depending on the brand and how much your bird eats. It has to be good quality food, no joking around, because these birds get serious health problems if they eat junk.
An avian vet is another hole in your wallet. A checkup runs about 150 to 300 reais, and you need to take it at least once a year, maybe more if your bird gets sick. Meds and exams get pricey fast. Then there are toys, perches, a cage big enough - grey parrots are large birds, they need space - all of that is a heavy investment upfront, then it's periodic maintenance.
Bottom line: you spend around 250 to 500 reais a month just on food and basic care, not counting vet emergencies. Annually it gets expensive, but some people think it's worth it because this bird sticks close to you, interacts, actually has personality. Just don't get into it thinking it's cheap, because it's not.
Don't fall into the trap of thinking a grey parrot is cheap just because the initial price seems affordable! The monthly costs are pretty heavy: quality food (fruits, vegetables, special seeds), avian veterinarian care (which is expensive and not always easy to find), toys to enrich the environment, and a decent cage and perches eat up a good amount every month. On top of that, there's the extra electricity for heating, humidifiers if needed, and these birds live for decades, so it's a serious financial commitment that a lot of people don't plan for properly when they're thinking about getting one.
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