That's an excellent hatch rate for shipped eggs. 0% is not uncommon, esp from ebay Try McPhersonFarm. I don't know if they have buttons but I know they have quail of some kind...
I got all my chicks from McPherson, mille fleurs d'uccles, araucanas and also got two pairs of button quails. Very nice and the buttons laid on the first day I had the girls home. I can recommend them for sure. She has all colors of buttons and just hatched some more. She also has coturnix amongst many other fowl. She custom hatched the mille fleur for me by request.