Schnucks South City is open 24 hours, great for late nite shopping. They are at 3430 South Grand.
Shop-N-Save at 3865 Gravois Ave is a newer store, their hours are 6 Am till Midnight.
Shop-N-Save at 4660 Chippewa has very narrow aisles, and the cashiers seem to be a little slow in check-outs.
Aldi is at 3721 S. Grand
Avenue