It depends on what you would like.
I have gotten them for free and then I have spent a huge price. Most times you can pay $25 for a pair as people want to help get rid of roos.
I have mine for pets and broody hens. I raise a few chicks so I can have more broody hens. I like the bearded ones the best.
I have a certain colors I like but have yet to obtain them. Still an all, we have fell in love with the breed. No matter the color, they can be very loving.
I have one very spoiled and loving hen that I hatched from eggs that I got from Fluff N Stuff Silkies. Melanie sent me more than I paid for and half of them hatched. This one hen bonded with me and she would love for me to hold her and pet her all day. I adore her as much as she does me. She is a blue color even though I prefer buff but color is only skin deep.
Buy from a reputable breeder and you will get good quality pets as well as good temperaments. I have gotten skittish and not so loving Silkies from people that had inferior stock.