you dont need to buy it through ifixit, its just a comprehensive guide, telling you what you need and how to fix it.

You can get a kit for cheap on amazon.

https://www.amazon.com/Veanic-2-Pack-Replacement-Joystick-Controller/dp/B07MRJ12HX/

Just from amazon:

Veanic 2-Pack 3D Replacement... https://www.amazon.com/dp/B07MRJ12HX?ref=ppx_pop_mob_ap_share

1 Set Analog Silicone Thumb Stick... https://www.amazon.com/dp/B06XKHJC5C?ref=ppx_pop_mob_ap_share

Fix them yourself. It’s $15 and like 20 minutes of work.

Video: https://youtu.be/rUTuOOZlX9w

Description: https://www.nintendolife.com/news/2019/07/guide_how_to_fix_a_drifting_nintendo_switch_joy-con_analogue_stick

Kit: https://www.amazon.com/dp/B07MRJ12HX

Remember to calibrate after you do the hardware switch.