Cannot speak for your area, but here in NYC:
Ride Aid - nearly every other week Tide is on sale (usually liquids and pods, but sometimes powder)
Target
Various other supermarkets such as Morton Williams/Associated, Shoprite, etc...
Rite Aid nearly is always the lowest.
https://www.riteaid.com/savings/weekly-ad
Last week Arm & Hammer liquid detergents were on sale at $1.99. They sold out of the stuff in a few days, ditto for when second truck load arrived later in week.
In fact you can always tell which detergents are on sale at local Rite Aid, as that is what you'll see overwhelmingly at the laundromat which is one block or so away.
Ride Aid - nearly every other week Tide is on sale (usually liquids and pods, but sometimes powder)
Target
Various other supermarkets such as Morton Williams/Associated, Shoprite, etc...
Rite Aid nearly is always the lowest.
https://www.riteaid.com/savings/weekly-ad
Last week Arm & Hammer liquid detergents were on sale at $1.99. They sold out of the stuff in a few days, ditto for when second truck load arrived later in week.
In fact you can always tell which detergents are on sale at local Rite Aid, as that is what you'll see overwhelmingly at the laundromat which is one block or so away.