Found a few sites, this one is local to me. http://www.offray.com/howto.html
I was thrilled to see that Offray is the brand the dollar store has. - they are manufactured up the road from us. DH's family used to trek 50 miles to the factory to fill a bag for a buck. (small paper grocery bag - and the most beautiful designs of bows!!)
I really should look into this if they still do it. I used to make bows when i was little, now if the spirit moves me i'll do curling ribbon. Christmas gifts don't get bows. but the Offray ribbons and bows are really fantastic!