The uSDX is not a great receiver or transmitter but it is usable and amazingly small. I bought mine through AliExpress. "uSDR uSDX 10/15/17/20/30/40/60/80m 8 Band SDR All Mode HF SSB QRP Transceiver Compatible with uSDX QCX-SSB".
Here's a recording of how a fairly week signal on 40m sounds:
The first unit I bought arrived with a broken screen. The AliExpress vendor provided free shipping for the return and refunded my payment.
I previously built the same circuit but this fully built version is superior.