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Sony is killing off recordable Blu-ray, bidding farewell to disc burning | TechSpot
(www.techspot.com)
This is a most excellent place for technology news and articles.
While not as cheap as suggested, they aren't anywhere near a expensive as you're suggesting.
https://www.aliexpress.com/item/1005004217228740.html true, now that you've showed me example, on Amazon it's cheaper, i just didn't bought Blu-ray disks before and this is what I've seen from advertisements