Product from childhood still a thing?

When I was younger my mom had this like bed extender when she had my little brother and sister. It was like a little crib or bassinet but it had one side open and a bracer that would slid under your mattress to make it level with your bed. There were rails on the other three sides. It was literally like attaching a crib to the side of your bed so you could cosleep with the baby without the baby being between the two of you.

Does anyone else remember these or what they were called? Are they even still a thing? I don’t think I’ve seen one since the 90s but I feel like it would be really helpful lol