Hmm. I think I'll just go over the start-up costs of my indoor birds, because an aviary with so many birds is a whole other story!:19:
Since I live in South Africa, the conversions might be pretty interesting to see if it is less or more expensive here!
I have 2 show budgies and 1 cockatiel. My hand reared show budgies were
$35 each, and my hand-reared cockatiel was
$38. At a pet shop, you can get an untame budgie for as low as $8-$10. All three of mine went for basic vet checkups and my avian vet, which probably cost around $45 in total, or
$15 dollars each (interesting that it is more expensive overseas). I recently bought them a new double decker cage on sale for $210. This was a steal, with the original price being $350. This is a very massive double cage though (dimensions of 66"H, 36"W, 25"D), so I would estimate a ordinary large cage appropriate for small birds to go for half the price, perhaps
$125 (again, in South Africa!).
I also choose to feed my birds a really good wholesome food that is on the pricier side (at least by South African standards) called Versele-Laga. A 1kg bag of the budgie mix is
$11, and the cockatiel mix is
$15. Most of their fruits and veggies are home-grown in our garden, so I suppose that saves quite a bit of money! I also give them millet spray, which costs around
$5 for a pack
of 4 or 5 sprays. So I probably spend around $30 to $40 on food per month, depending on whether I buy fruits and veggies instead of using my home grown variety.
They have two play stands, both of which cost around
$20. In terms of toys.... hmmm. I'd estimate that for the many toys that I've bought for these three (both in their cage and on their play stands) maybe adds up to $90. So, that's
$30 per bird (I've spoiled them way too much!).
So, in sum, for three smaller birds (in South Africa at least) with large cages, a good diet and lots of toys and places to play:
Start-up prices - the basics: bird + vet + food + toys + nice cage
A Single budgie = $241
A single cockatiel = $248
For me the biggest long lasting financial consideration is food, vet check-ups, and buying new toys to replace old ones.
Anyway, not sure if this will help many people as it is from an international perspective, but it will definitely provide insight into how costs differ between different countries! Looking at other responses, it is definitely cheaper here!