I have parrots, and a leopard gecko. The most expensive thing for the parrots were their cages. And I will be upgrading one of them to a stainless steel cage which will probably cost upwards of $1000. They are mostly on a fresh food diet, so they just eat whatever's in the fridge. Beans, greens, eggs, chicken/fish, nuts and legumes, fruits and veggies, cheese.
They get clips and trimmings several times per year and a check up. Birds are pretty hardy and don't typically get long drawn out illnesses; you wake up one day and they've fallen off the perch, very little drama involved.