Take Airline highway over the old bridge and on the right just pass the Circle K there is a bait shop. Not exactly sure if they have shiners but that is about the only place in that area to get them. Next closest place from there is in Brusly.
No place in Central that I am aware of and I live there. There is a bait shop in Baker on Hwy 19 on the right as you head towards Zachary that might have them.