Hello,
You are correct . If we do not have a fabric listed in our supply list for a design, that means we do not carry it on our website :( This design uses 40ct. Vintage Buttercream linen and this link will take you to our 40ct. Linen page so you can see the colors that we do have available:
http://www.everythingcrossstitch.com/wichelt-40-count-linen-mrp-p49286.aspx
It looks like there a few that are close in color to the buttercream linen that you could choose from there :) Hope this helps!
~Kristi @ ECS