Naturally there are only small percentage of Red Nest in some farms. Due to the high demand many had resorted to create or to make Red nest to an extend of using artificial coloring.
I had came across shops selling coloured Red Nests.
I guess those who bought it didn't know about it. It is not easy for those who are inexperience in this trade to differentiate between artificially colored nests and the original Red Nests.
If you have experience in Nest trading you could distinguish it. Of course there are ways to make or create Red Nests other than waiting for the small percentage from farms or using artificial colouring. Well this is a trade secret.
I would say getting or doing White Nests already so hard for some and the Red Nests is one step beyond the white nests. Therefore I would suggest concentrating on White Nests until you are good at it then only you should consider about Red Nests.