The UK moved to stamps with unique QR codes back in 2023 for the bulk of its stock.
replyhttps://www.royalmail.com/sending/barcoded-stamps
There are still some "Forever" stamps (those with pictures on or Christmas Stamps) but the old non-QR code non-forever stamps stopped being legal a while back (but you can always swap them for the new ones for free).
I've had people try and reuse a QR-coded stamp, you just get a postcard saying there's an item of mail with invalid postage for you to collect (and pay for). You get to look at it before you decide whether to pay the fine or not and then your argument is with the sender to reimburse you or not.
I thought that for a while now all stamps are "forever" rather than it being s separate type.
replyIt's common in the UK to sell them both with a £ denominated value on them or the class of service. My brother bought loads of the latter a few years ago, which was a great idea, because as mentioned postal rates have increased significantly. The UK post office will also exchange your old unused stamps for new versions (now with QR codes or with sticky backs) for free. So even if they go out of date they alcan be upgraded at no cost.
replyUSPS still sells denominated stamps from $0.01 to $10.00, in addition to "First Class Forever" stamps - see near the bottom of the filters sidebar on https://store.usps.com/store/stamps
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