In all the wards I have been in, the Mother's Day gifts have been left up to the SS presidency. The SS presidency positions don't usually go to the most reliable guys in the ward. Usually retired guys too old or apathetic for more important callings, or younger guys who need a calling that doesn't require much time or effort.
I was SS president for a while (one of they younger guys, too busy at work for a calling with a lot of time restraints), and I think the Mother's Day gift was the one big responsibility I had, other than filling in for teachers who didn't bother getting their own substitutes.