A cable lock is a simple, cheap, and effective way to prevent unauthorized access - many police departments give them away to the public, no questions asked
Preventing accidental discharge or unauthorized access (especially through theft or by children or other family members within the household) is the responsibility of each gun owner. A firearm can be a hunting tool, a personal- or home-defense weapon, or part of a sport or hobby, but in each case, owning and possessing them comes with serious responsibilities, and potential criminal consequences if not stored responsibly.
Secure storage means storing the firearm and ammunition separately. The firearm should be disabled or inaccessible except by the owner or owners of that firearm.
This is not a controversial topic, the NRA explicitly lists six common approaches to safely storing firearms.
There are many resources available if you can't afford a safe or lock: many local police departments will provide gun locks at no charge. Check out projectchildsafe.org for more resources.
Having a firearm accessible during a mental health, substance abuse, or domestic violence crisis is a worst-case scenario.
But what options does a gun-owner have when they recognize that they should've have a gun around them?
Giving the firearm, temporarily, to a trusted family member or friend who lives outside of your home. There are no legal restrictions on this, but it's important that the firearm be transported unloaded.
Reach out to your local gun shop. Tell them you need help storing the gun outside of your home temporarily. They will likely either store it for you or give you contact information for another location that can.
If the firearm can't be removed, unload any guns and remove the ammunition to another location. Even having to drive to another location to get it can be enough to prevent an impulsive decision.
Store the weapon in a hard-sided gun safe or lock box, or lock the firearm with an impenetrable trigger or cable lock and give the key to someone outside the household.
If you're a gun store owner, you can find more information about how to communicate the options to your customers and community here:
https://safercommunity.net/gun-shop-project/