I've been looking into it recently. Waiting on an email from Gollancz the publisher.
You can still get a single edition hardcover of The Way of Kings on Amazon at least.
As for the later books, that is what I am in touch with Gollancz for. It's likely they'll be doing a re-run of the hardbacks for their 10th anniversaries. So 2024, 2027 and so on.
Generally hardbacks are only available new at launch as far as I can tell, and these limited re-runs.
If you're in the UK then you can grab the new(ish) hardcover that's a single volume.
The Way of Kings: The Stormlight Archive Book One https://www.amazon.co.uk/dp/1398703621/ref=cm_sw_r_apan_i_NZHHMJ56NV9F3WACYGEN
This one with the European armor. https://www.amazon.co.uk/dp/1398703621/
It looks awful to me.
Amazon have rereleased TWOK hardback recently. The Way of Kings: The Stormlight Archive Book One https://www.amazon.co.uk/dp/1398703621/ref=cm_sw_r_apan_glt_fabc_G07KP0MKBHBCYGM9RGYC
Nice! Just to let you know, this Thursday a reprint of TWoK UK HC is released:
https://www.amazon.co.uk/Way-Kings-Stormlight-Archive-Book/dp/1398703621