Many of us probably need a wi-fi extender, but have yet to pull the trigger. The deal currently on the table from TP-LINK may give you the nudge you needed. Their wi-fi range extender lists for $169.99, but at the moment you can purchase this for 43% below list price ($96.96 - See item on Amazon).
TP-LINK's device promises to expand your coverage up to 10,000 square feet and has the capacity to handle, simultaneously, gaming and 4K HD streaming with dual band and AC1750 performance. They've designed it to plug directly into any outlet, and it's "smart signal indicator" will help you discover the best placement for maximum coverage.
Currently rated 4 out of 5 stars on Amazon (178 customer reviews).