I got mine at www.violetbarn.com and am very happy with the quality of their plants. The price is very reasonable considering what you get. I just got these plants in May and they are already blooming. All the plants i got from them are now budding or blooming. I am too new at Streps to know of very many outlets. I am sure these people can help you with that.
You will not be sorry ......they are so much fun and so easy to care for.