11-36 casette change

Hi, i have an issue with my gears slipping under load. I replaced the chain which has not resolved the issue. My local bike shop has checked and advised it needs a new rear casette, however they are unable to source one from their supplier.
I have been looking online and rang round my local bike stores and it appears they are quite hard to get hold of. The bike in question is a talon2 29er with a shimano 9 speed 11-36 casette.
I’m pretty new to cycling and not sure if there are any other options, plenty of 11-32 in stock locally. Would these be a direct swap? I rarely use the very lowest gear so could manage with a slightly taller lowest gear of that is what it would be? I’m running a 22/36 front chainring if that makes any difference which I find a bit low geared on flat ground.
I have been looking online and rang round my local bike stores and it appears they are quite hard to get hold of. The bike in question is a talon2 29er with a shimano 9 speed 11-36 casette.
I’m pretty new to cycling and not sure if there are any other options, plenty of 11-32 in stock locally. Would these be a direct swap? I rarely use the very lowest gear so could manage with a slightly taller lowest gear of that is what it would be? I’m running a 22/36 front chainring if that makes any difference which I find a bit low geared on flat ground.
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I will go for a 32/34 tooth option. Is the 11-36 a rare size or something? Was not expecting it to be so difficult to find in store.
Tredz have a 12-36 alivio in stock btw https://www.tredz.co.uk/.Shimano-CS-HG400-Alivio-9-speed-cassette_72777.htm#
but the cheap sram 9 speed 11-32 you can pre-order for November !!!!