I started from seeds just a few months ago. I buy from etsy.com since its all small businesses and they seem to have a wider range of succulents
Currently my favorite seller is UnusualSeeds.
I bought 4 different succulents from him, he sent me an extra bag of seeds as a gift. His website has information of how to sew your seeds and honestly all of my seeds have sprouted and are doing wonderfully I'm impressed!