13Deals offers the JMK 6-Outlet Wall Tap Splitter, model no. 26860, for $5.49 with free shipping. That's tied with our mention from last week and the lowest total price we could find by $2. It converts two outlets into six side-entry grounded outlets.
As a reader discovered, Harbor Freight Tools offers it in-store for $2.99 (It can't be ordered online at this price.)