I have tried several times, most of the time it never really worked.. I am assuming its not up to RC, its up to the designer. So even if you do a special ordering there is no guarantee that they will be able to do it. Most of hte times I received an email a week later saying they are still trying to contact the designer however they are not responding.. and then 3 weeks after that they will email me again saying they couldn't do it for me.
I would really not reply on it at all. I have only had 1 of my special orders ever come back into stock and available for me to order.