These are inexpensive PWM/SBUS receivers for compatible multi-protocol radios, not ExpressLRS receivers. The discount is useful only for builders who deliberately need D8/D16/SFHSS compatibility.
Verify protocol compatibility before buying. RadioMaster explicitly notes that the R86C V2 does not support a FrSky transmitter directly and is intended for an MPM radio. EU orders may have VAT applied. No expiry date is stated on the checked product pages, so availability and price can change without notice.