I would suggest stopping by your local roofing supply wholesaler and see what they have in stock, I am unaware of any red roll roofing products but that does not mean it doesnt exist. The wholesaler could order it for you if it indeed exists.

If nobody locally stocks it, you may need to ordeer a full pallatte to get what you want. Tile red, Forest green, White, Black, sand and brown, are the basic colours for roll roofing.

What will you be using it on? There are other products available now for lowslope roofs, some of them paintable. All of them better than roll roofing.