For in-store pickup only, Sears offers the Craftsman Wet/Dry Vacuum Fine Dust Filter, model no. 17907, for $9.99. That's $3 under our April mention and the lowest price we could find now by $12. It fits Craftsman wet/dry vacuums of 5-gallons or larger.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.