An option in line with the above are old actual safes.
Second hand may be cheaper than a new gunsafe, and a lot tougher too.
If you have large locksmiths in country, they should have a lot of floor stock second hand or 'refurbished' as they call it.
If you can find them locally in classifieds, sometimes people want them gone for just a few bucks
Some options to google
Second hand safe, refurbished safes, Chubb Booksafe size 9
Heavy safes even up to a ton are not difficult to manouvere, you tilt and get pipe sections underneath them and roll into position
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