AF FF 858 SG and SG Rosada.....difficult to find is an understatement...online shops usually don't sell them online, and usually limits apply. If you have a source, I too would like to know where. I believe the AF FF 858 SG are not in production anymore. The AF FF 858 SG Rosada is out in some shops, but most that I know don't sell them online.
Good luck in your quest!
LJ Peretti has incredible selection and great prices. You have to call to place an order after viewing their online catalog... They do have the 858 plus about any other domestic you could imagine, and from one order I've placed with them I can highly recommend: