I'm going to nominate Dendrobium Cucumerinum, also sold as Dendrobium Cucumeranium and Dockrillia Cucumerinia also known as The Cucumber Orchid or the Gherkin Orchid. I've seen this one available for sale all over the place.
IOSPE PHOTOS
Temp: Depends on who you ask, looks like it can thrive in a lot of temperature conditions, IOSPE says from Cool to Hot. Seattle Orchid says Intermediate to Warm.
Looks like most of the plants I have seen available are blooming size.
Price is between 20 and 30$ depending on where you buy it.