Sometimes people are overwhelmed by the choice so to make it easy to begin I make a special offer of 12 plants for the price of 10, but of MY CHOICE, plus postage.
I generally send plants which are the easiest to grow for beginners. Any plants will grow better if they have prepared soil and water, especially when first planted. I have a fairly good knowledge of climate areas of Australia and will choose those I expect to do well in your area. Salvias will often be in flower.
If you want a certain size or colours it is better to order them individually.
This is not meant to be a way to get plants cheaper but to make the choice easier for you as an introduction to salvias.