Yes! I breed/hatch/keep them.
It sounds like you are looking to keep the Coturnix/Japanese quails if you are wanting to eat/sell eggs. There are several other different breeds. If you want to keep them in an aviary or together it is best that you put them all in at the same time - a bit like some tropical fish keeping - as they can be horribly territorial. The worst problems are pecking at eyes and ears until they bleed, feather plucking until bleeding, and once there's blood I'm afraid it is quite possible that they will peck away until death. These harsh problems are better overcome by not overcrowding (which it doesn't sound as though you will intend to) and also by either keeping all females (believe it or not for once!!) or by keeping male numbers right down in relation to females. Different pages on the internet will give you an overall guide in general from people's experience.
I would suggest you look up a breeder/hatcher like myself for price and history/age of a bird as for one the breeder SHOULD know exactly how old your quail is by the hatch date and is often cheaper than the local pet store. The problem that you should look out for here regarding bird age is that quail often only live for a couple of years. Part of this reason is they are fast growing, being fully mature after 50 days of hatching and laying eggs at around 6 or 7 weeks. You would hopefully be able to reliably buy from a breeder/person that hatches out a bird which was the age you wanted, perhaps at point of lay, and know that you were getting a fair deal.
They are ground dwellers, quite hardy and live happily amongst other aviary commuinity.
I'm wittering on a little as I've had a LARGE glass of red wine (it's been a very busy week
) but I'm here if you want to know any more.
best regards, Amanda.X