You can actually spend $30 or less and make an incubator. And, yes, many people have used the $40 something incubators from Tractor Supply and had quail eggs hatch quite well. Sure, you can go all out and purchase a monster of an incubator (I'm buying a hovabator 1588 with autoturner and forced air for under $200), but you should get at least a 75% hatch rate with a simple $40-$50 stillair Little Giant.

Yes, they CAN be fed chicken feed. I keep quail already, I know. I, as well as numerous other people, use chicken starter or grower, with 20-24% protein with no issues.