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Best Choice Yieidui 
Yieidui Crystal Radio It Has an Impedance Matching Transformer Can Receive Radio Signals Normally DIY Radio Kit This radio already has an impedance matching transformer, so you can use low-impedance headphones.Best Value HJW Electronics 
Crystal Set Radio Kit of Electronic Parts with Added Single Transistor Option Tried and tested design since 2011
Quartz Crystal Oscillators Amateur radio CW / PIC HC49/U Various Frequencies FOR QRP / WSPR / FT8 & OTHER POSSIBLY INTERESTING FREQUENCIES. QUARTZ CRYSTALOSCILLATORS. FOR HAM / ELECTRONICS HOBBYSTSDomzhili Domzhili Crystal Radio Simple Electronic Circuit Board Assembly Can Receive Radio Signals Normally DIY Radio Kit Low-impedance headphones are fine. No headphones are provided. Bring your own headphones!
Ferris CB Radio Crystals pair, TX 27.9 MHz and Rx 27.445 MHz New Tx is 27.9 MHz and Rx is 27.445 MHz.Byttlerom 
Byttlerom Crystal Radio It Has an Impedance Matching Transformer Can Receive Radio Signals Normally DIY Radio Kit The key to the success of a crystal radio is to be to connect a very long antenna (preferably over 10 meters) and a goodxelea 
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