Wow, those prices are REALLY high.
There are a lot of vendors that sell here on BYC, and also on E-bay who have eggs for a much more reasonable price. Many of them sell mixed batches of all kinds of colors.
I personally got some really great colors from eggs I bought from Quailladyoffortmeyers, who posts on here all the time. I'd contact her rather than buying them from Stromberg's. You will get a lot more eggs for the money
I hatched both buttons and Coturnix this summer, just for pets. They're both interesting and fun birds, but I think I like to Coturnix better, because they are actually VERY friendly -- mine are tame like chickens, and now come up to me for treats. The buttons CAN be tamed, but mostly if you raise them as a single bird right from hatch, from what I understand, but all of mine are basically terrorized when I approach the cages, and run around constantly when I'm working with them. Still pretty to look at, but not tame by any stretch of the imagination.
There is a website cyberquail.com that talks about taming buttons.
Since you need to keep them in the barn, I don't think you have any choice but to do Coturnix, as buttons just would not survive that in North Dakota in the winter.