The RTL-SDR BLOG V3 is a low-cost software defined radio USB dongle.
Buy RTL-SDR receiver dongle (v3) + antennpaket dipol at the right price @ electrokit
Sparkfun Australia - Express Delivery Australia Wide
RTL-SDR V4 (Software Defined Radio) with Dipole Antenna Kit – Elektor
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Dongle RTL-SDR.com V3 TCXO + SMA + Bias-T USB key with R860 tuner
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ZEM-4300+ Mini-Circuits