There are some suggestions that we might need to keep wearing masks in some situations well into the winter months:
https://www.bbc.co.uk/news/health-51205344
I've also been buying disposable masks from B&M and I've noticed that the price seems to have kept dropping since I started buying them from there. I've not bought any recently though, as I've still got several full boxes of them in the boot of my car at the moment.
Face masks (from all sources) certainly seem to have come down in price a great deal since the start of the pandemic. When I first went in search of some at our local pharmacy (which doesn't rip people off with their prices), while there were still shortages in many places, I was offered a choice of buying disposable masks at £1.99 each or buying a single re-usable mask for £7.99!