I WFH, so my chair gets a lot of use - it’s one of the tools I use.
If I was an electrician, or I commuted to work I know I’d be paying for tools, fuel, repairs, train tickets etc
I don’t know what your circumstances are, but I find a cheap chair falls apart pretty quick.
A lateral flow test or something using a lab?
Must be a lab test as lateral flow is like £2:
https://www.boots.com/flowflex-antigen-rapid-test-lateral-flow-self-testing-kit-1-test-10312288
Or $7 in Walmart: https://www.walmart.com/ip/Flowflex-Covid-19-Antigen-Home-Test-1-Test/837992467?classType=VARIANT&athbdg=L1200