BI7LVX You can find circuit diagrams for frog croaking and leather shoes online. You can then use the diagrams to order PCBs from JiaLiChuang, or if that doesn't work, you can buy a kit and assemble it yourself.
BI1UDG-711 The original Pixie harmonic suppression was very poor, with excessive stray emissions that prevented it from being used. I'm not sure about the other aspects, but it should be improved.
BG2KAJ The "Didi" device is a pure transmitter; it can still be detected, and this is my own replica version that I drew. https://oshwhub.com/nyara/cpk4
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