You may just have to wait...usually elann yarns come in and out of stock, so in a month or two they'll have more. I know that happened with their alpaca...it was completely gone for a while but now it's back with tons of colors available.
As long as they are not discontinued yarn, they'll have in stock sometime. You can also google and look in eBay. I got my DB cotton/silk discontinued yarn from eBay.