I'm thinking it may be out of production. Your best bet might be eBay. You can save a search there and get an email when any new Vonnel or Love Knit yarn comes up for auction. You may be hard-pressed to find the color that you currently have in sufficient quantity. Could you turn the afghan into a scrap ripple afghan? I think that would be your best bet, especially if you are working from stash. Perhaps varieties of red and gray colors?
When I did a search on eBay, I got this listing:
http://www.ebay.com/sch/i.html?_odkw...onnel&_sacat=0