Sometimes they don't work so the best is to buy it from a store that give's you a 2 weeks return policy so that you can tested it out and see how it works.

Here is a $30 example:

Leapfrog IR Remote Extender



Features:

• Extends the range of any remote control and operates through obstacles from up to 120 feet away
• Freestanding units works with most remote controls and A/V components
• Installs Easily
• Expandable system: Add an additional receiver (LFIRX-RX) and/or transmitter (LFIRX_TX) sold separate

• Converts the infrared signal from a standard remote control into a long-range RF radio signal
• Operates most audio and video components from up to 120 feet away
• Remote control extenders use the 418 MHz frequency band to command components through any obstacle, including walls and floors.
• Easy to use
• Batteries included
• Can control virtually any household device that is operated via infrared remote control, including satellite receivers, personal video recorders, VCR’s, CD players, stereo receivers, tape decks, etc.

Product Description
Rev up the power of your remote control with the Terk Extender Dual Pack. The extender pack gives you the power to operate AV components such as a DVD player, satellite receiver, personal video recorder, cable converter box, VCR, CD player or stereo receiver through walls and floors up to 100' away. Compatible with most infrared equipment, the remote extender features wireless technology for easy installation. Simply plug in the base unit near components you want to operate and plug in the receiver unit where you will be watching or listening. Comes with a 4' infrared extender cord. Imported. 5Hx3-1/2W".

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