Best Day/Times To Shop

When are the best days to find deals at GO? Has anyone noticed certain days when there are more unique items at mega discounts? Is there some sort of delivery schedule that stores have which puts fresh deals out on certain days?

And a follow up to that, what time of day is best? Is going for store opening great because they restock overnight or is it best to wait a few hours after open for them to stock new items on the shelves?

Or do they restock throughout the day randomly?