In my experience I've found that you should buy the unusual plant when you see it. If I don't, I'll end up pining for it and then it won't be available next time
I was at San Gabriel Nursery today and found this unusual Heather, Erica speciosa. It is from South Africa, wanting mostly sun and well-drained soil. Yay! Hopefully it will like my super sandy soil. I love that red with the green edge! I bet the hummingbirds will love it too!