That is about the going rate for a retic, they are notoriously difficult to keep alive and I have heard that no one has raised one to adulthood from that size. Not sure how true that is. Everyone I have asked says start with Motoro.
people have got them to adult size its just really hard because they are slow growers, put in small tanks, not enoghf food, and they arent hardy so they dont make it to adult size
I've had my pair of retics for 1 and a half years and they are very hardy, i think. I think that its a good price seeing how here in windsor, ontario, canada they go from anywere from 75-125 dollars. Just make sure the ray is healthy and eating.