lpg the royal bag is great, tho, it just needs to be black .. get one cajeta, then we can gather them all and dye them together, might work out cheap.
You can't do it in a washing machine, you need to dye it in a special industrial bath at a really high heat.
i think.
(100% polyester).
What about..
http://www.michaellinnell.co.uk/product_info.php?cPath=30&products_id=124&osCsid=qui7p9ok1unb3evsn644bcera6
From £30...