There are several major benefits to getting young bandensis as opposed to hatchlings or eggs. They are much easier to feed and much less expensive to feed. They have also survived this long, making it past all the mysterious and non mysterious deaths that hatchlings seem to go through. They don't have to be but in different tanks as they get bigger because they are already big enough not to be completely lost in a tank.
IMO, these being offered are the best thing since glass tanks.
I took some pictures last night and I will post them so you can get a size reference. I think they are about 2 inches. They are still eating shore shrimp, but I am trying to find some frozen shrimp for them. They also will eat frozen mysis, and some will eat krill.