For those of you who have had trouble getting an ADALM PLUTO SDR, there is
currently a small amount of stock at distributors:
Digi-Key, $99.99, 54 in stock:
https://www.digikey.com/products/en?keywords=pluto
Arrow, reportedly 86 in stock, but web site sucks so I can't confirm:
https://www.arrow.com/en/products/adalm-pluto/analog-devices
The PLUTO doesn't use a TCXO, though some people have replaced the standard
40MHz 3.2x2.5mm SMD oscillator with a TCXO, eg the ±1ppm Taitien
TXETBLSANF-40.000000, which costs $2.46 ea (quantity 1) from Digi-Key:
https://www.digikey.com/product-detail/en/taitien/TXETBLSANF-40.000000/1664-1270-1-ND/6126581