I found Betty Crocker potatoes at Dollar Tree. These bags have about 25% more than other brands of potatoes. Use a $0.75/2 printable Betty Crocker coupon, and get two bags of potatoes for just $0.63 each!

Use one $0.75/2 Betty Crocker Potatoes (coupons.com)

Final Price: $0.63 each, when you buy 2