Use your phone to get Purex detergent for as low as $1 in stores at Rite Aid. This week, Purex is on sale for $2 each when you buy three. There are also Ibotta rebates available for these products. For the lowest price, purchase Purex Pacs and submit your receipt to get $3 cash back from Ibotta. Or get Purex liquid detergent for only $1.50.