You can shop around for used safes.
I picked up this Fort Knox for $1K delivered and installed. They serviced and re-greased it. They even gave me tools and showed me how to change the combo so I am the only person who knows what it is. It would cost $3K new. It's a safe....what can you do to it?
Some more advice from a safe expert on another forum:
1. Most gun safes aren't really good fire protection.
2. Most gun safes aren't really safes and don't provide that much protection from a skilled thief.
3. They do provide protection from unauthorized access but that can be accomplished cheaper.
Collections worth less than $2,000 can usually be insured and placed in any secure cabinet.
Collections worth $2,000 to $5,000 can be insured and placed in most typical gun safes.
Collections worth $5,000 to $10,000 should be insured and placed in a double walled, composite, or B-rated plate safe.
Collections worth $10,000 to $50,000 should be insured and placed in a C-rated safe.
Collections worth $50,000 to $500,000 should be insured and placed in a TL-15 (E-rate), or TL-30 (F-rate) depending on insurance requirements.
Any collection exceeding $500,000 in value should be redistributed to us poorer gun owners instead of being locked up in a safe.