I think the can lay all year as long as they have enough heat and light but i think it would be nice to give them a few months off a year so they can relax for a while. I've only seen button quails at a pet store once. Try online buy/sell websites like craigslist or something. I found one of mine on an aussie website called gumtree. If you have weekly markets where you live or a produce shop, you could also look there.