ID for grocery store orchids - oncidiums and dendrobiums?

[janewobb]

Hello - I'm a beginner orchid enthusiast living in northern Virginia, USA. (I posted this in the beginner forum but thought I would cross post here.) I have had fantastic luck growing phals for the past few years (most rescued from the dumpster) and I've branched out to new orchids and bought some from orchid shows (so they are tagged). Our local grocery store just got in some great orchids at great prices, but they aren't labeled. I think most of what I got are oncidiums and dendrobians, but I would appreciate verification and additional information if possible. I'll post five photos of the orchids and I greatly appreciate any help. All but one are in bloom.