silver is available, gold and platinum are sold out. the only benefit you get is a discount when you submit a minimum of 20 cards at a time, and they all have to fall in one of their categories (different years for sports cards but trading cards are all one category).
otherwise you’re paying at least $50/card and who knows how long the turnaround time is. and you could be forced to pay more depending on the value.
https://www.psacard.com/pricing