Is it really all that common? I've never seen this Oncidium before. I would grab it in a heartbeat. I'd probably grab it out of a shoppers basket when they weren't looking, if it was the last one.

....
not really.
Your Onc. is outstanding and I love it's name, so fitting!
Enjoy!
P.S. Did you happen to buy this on line and if so where? I'd love one of these.