With orders of $25 or more, Amazon offers the Downy Fabric Softener Sheets 40-Count Box in April Fresh for $3.07. Clip the $1 off coupon to drop it to $1.07. Plus, Prime members bag free shipping. (Non-members can bag free shipping with orders of $35 or more.) Although we saw it for a buck less a year ago, that's $2 off list and the lowest price we could find for a 40-count pack. (For further comparison, Walmart charges $5 for an 80-pack.)
Note that this item is part of Amazon's "Add-on program"; it can only be purchased with an order of $25 or more.