54 Purex UltraPacks, $6.37 shipped with subscribe & save, or $.12 a load.
As always, you can manage subscriptions under your account and cancel subscriptions or skip a shipment at any time.
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Besides tax, this works out to be about the same price as getting them for $1.99 (coup in 3/3 rp) for 18 ct this week at Jewel