I have mostly ordered from RABOM and they have Shiff and Offray ribbon. I didn't know until I came to this site that there were names for the ribbon they carried.
I tried the ribbon from Hairbow Center. I did not like the texture of that ribbon and didn't think my korkers came out as nice and tight as they did with the other ribbon. It has a slippery feel to it also and was a little more difficult to handle while I was trying to hold creases when making my bows. It is not Shiff or Offray. Maybe it has a different name.