I love Semperviviums, hardly the most rare or unusual of plants, but some very choice forms can be found. I buy them anywhere I find them as the variety of colour,texture and size is seemingly endless.
The best place to buy them here in Southern Ontario is Cavendish Perennials ( they do mail order). They have an amazing selection of Semps. and also have other hardy succulents such as Jovibabas, Rosularias, Orostachys and Sedums.
Of course these plants look pretty sad this time of year but I'm posting some pictures of how they look in Spring.