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Here is an inexpensive option for secure in home storage.

My wife and I have 5 teens. They've all shot and know gun safety...but they are teens. When we first started buying guns we bought two small portable safes like you use in your car that could be opened by our fingerprint (there is a backup key). As our collection grew, this became impractical. So we purchased a locking metal gun cabinet (not a safe - no fireproofing, etc). It's bolted to the wall and locked. The key for the cabinet is in one of the portable safes so our kids cannot get to the key without using one of our fingers. That safe is in the same closet as the cabinet. We didn't want the key on our key rings since they are often accessible to the kids. If I'm caught without a weapon and can get to my closet, I have a chance to get into the cabinet regardless of where my car keys happen to be.

Note this is primarily for storage and not so much having quick-draw defense. That's what my EDC is for. But, if affordability as well as safety is an issue, this was a way to secure our long guns, pistols and ammo without it costing a small fortune. If the house burns down, the guns will be lost. If someone brings a blow torch into my closet, they can penetrate the cabinet. But those are risks I'm willing to take. The easy opportunity for a teenager to do something stupid...not so much.