The picture from Aquabid is of a hystrix, but what is known as a Brazilian hystrix. The picture looks like it is from someone's personal collection, not a seller of rays. I would ask the seller to send you pictures of the actual rays he has for sale. As stated, they are probably orbignyi rays and the seller is trying to pass them off as hystrix. Quite often rays labeled as "yellow hystrix" are orbs.
I may have another litter at the end of the year. My pair doesn't mate until late spring/early summer.
There may be some other folks on here with hystrix pups soon.
Also, the ray pictured is a beautiful specimen. Fresh imports usually don't look that good.