With orders of $25 or more, Amazon offers the Oral-B Glide Pro-Health Comfort Plus 2-Pack
for $4.06. Clip the 50 cents off coupon on the product page to cut it to $3.56
. Plus, Prime members bag free shipping
. (Non-members can qualify for free shipping with orders of $35 or more.) That's the lowest total price we could find by $4.
Note that this item is part of Amazon's add-on program and can only be purchased with an order of $25 or more.