Great find! I love those green C&Bs too, and was stoked to guide my sister and her husband to one (in Cedar Rapids, IA, from a WKC member who was nice enough to deliver it right to their house!). Congrats on finding one in such great shape!
The warming racks are out there if you're patient... they show up on Craigslist with grills sometimes, and Bman and I teamed up to find a never-used one at a CL storage unit sale. Or make friends with someone who travels overseas, where they are sold as a part of the regular Weber stock (which reminds me, I need to touch base with a friend in Ireland who is traveling back to the States next month...). Definitely one of the most useful Weber accessories I've come across!