I want to purchase two of the discovery boards of ST32L431. Where is the link for this?. Thanks.
ST does not have any development board with the STM32L431.
You may want to consider the NUCLEO-L432KC (32-pin device) and the NUCLEO-L433RC-P (64-pin device and SMPS supply for the core).
The devices on those boards are compatible with the STM32L431 with additional features you may chose not to use... (USB and LCD)
In the US DigiKey and Mouser are typical sources for boards that are currently available, price against both, see who wins after taxes and shipping.
For other boards, or early availability, you should contact your local rep or sales office.
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