I also just bought some Black ones from ebay a couple of days ago, but haven't received them yet. I hope I bought the right thing!
I also DID find some in Sable at Nordies in Mall of America. I looked through the whole department, without even seeing Oroblu. The SA showed me a VERY small Oroblu section, and the Tricot (the micro fishnet pantyhose) were behind some other Oroblu style! They were $18.50. I wore them briefly and they seemed to have a nice substance to them.
The package front just said ' Oroblu Tricot', but the back said 'Micro fishnet tights with elastane, cotton gusset.' (in 6 different languages).
In case that helps someone track them down over the phone, or for your online searching. Good luck!