Amazon has a great deal for the ClearMax 3 Outlet Indoor/Outdoor Power Splitter with Outlet Covers for $5.57 + Free Shipping with prime.
2-pack also available for $4.95.
Be sure to use promo code R9J792K3 at check out!
A bit about this product:
Allows You To:
Plug those big bulky power adapters into the splitter adapter, instead of power strip or wall outlets, giving you more space to get the full use of your strip
Expand your current outlet to 3 grounded outlets and streamlines your plugs into one power block
Get more space to push your furniture and equipment as close to wall as possible with it’s right angle shape