I went to Big Lots today and found this little beauty. It's a 50 oz. refill for $3.20!!!! When you buy them individually they are 7.5 oz for $1 on sale. You do the math..... :)
They are priced at $4 (still a good deal).
Go here and get a 20% off coupon and they will be $3.20. Coupon good thru the 31st.