Don’t you lot have local area garage sales on FB? I know you are still under Lockdown, but my wife finds quite a few decent things that are cash only transactions. Armslist was also the same before got greedy. Cash is inconvenient, but not dead and in some cases the only way to acquire things.
A few years ago someone down the road was advertising a garage sale, I assumed they were selling off their jumble, but when I next passed by the garage was gone - perhaps they had a literal garage sale. During lockdown one I passed by and they had a new garage.
The UK equivalent of garage sales are car boot sales - Usually run by a local charity, school or ‘good deeds’ society fundraising by charging the sellers for their pitch and buyers to get in.
I used to go to them but during the car boot season I probably have not been to one this century, I would normally be away for the weekend at an event, probably in a friends gazebo having a drink and helping sell their stuff for my free entry, or doing the charity tombola.
The bus stop over the road is used for village give-aways of unwanted things, there are local Facebook sales pages and freecycle pages but I couldn’t do with the bother of meeting people for their tat.
I normally do some buying at auction and selling them on, I put those on eBay or into a local ‘collective’ shop (I could sell on Facebook etc and avoid eBay fees but that would mean dealing with random local people)
Cash isn’t dead yet, but other than better private individuals or in fields there isn’t much use of it. If we spend notes in cash we end up with pockets full of change. Even when selling in a field these days most of it is by card - we just make sure that there’s a reasonable cash float to cover change for the cheaper things - and don’t put .99p on the price of anything
The only shows I managed to get out to last year were a couple of comicons and steam punk shows - people there generally have either the disposable income to not rely on budgeting by carrying cash, don’t want to carry much cash in a crowd, etc and are using cards. The general exception are young kids spending their pocket money, older kids either have their own card or are attempting to get mum/dad to pay