How should I choose an adequate preschool in the USA (specifically in CA,WA or TX)?

I'll cut right to it:In choosing a preschool, what criteria should I consider (from most to least important)?What's the median price (most places I called wouldn't even talk about it) for each location?How reliable are online "reviews"? I found most to be of dubious value. via /r/Parenting http://ift.tt/2nTe9CE