I bought an office chair in the Philippines and I'm really happy with it.

I got it on sale for about 3000 pesos including delivery, and since it's full mesh, I don't get sweaty on my back or butt. My butt doesn't hurt either, and even though I sit up high, the headrest properly supports the back of my head.
I had to remove the headrest on the one I bought before because it didn't fit properly.