I've tried bulk dandelion seeds and seeds from Baker. Neither were a success... That's why I opted to collect FREE dandelion seeds from my in-laws property when we visit. They have acres of them...I prefer free seeds while I'm figuring out the best way to get them to grow down here.
my mother brought me dandelion plants from her zone 7b. it was september. they lived till next summer. dig some plants when you visit your in-laws next time. it will be much easier than start them from seeds.