Right now Giant Tiger has the Pledge Duster Plus kits on sale for $3.97 and on each box there is an instant redeem coupon for $3.00 off. The kit includes a handle, spray cleaner, and two dusters.  I asked in the store today and apparently there is no purchase limit. Offer is listed in this weeks flyer which is good until Sunday December 30.
It looks like this offer is not on in Western Canada…:(
Not in Western Canada but they are only $4.49, ~$0.50 more.
I got $3 off at Walmart, there is a $3 off sticker on the front of the box. so it should work anywhere that has the coupon on the box