The GunVault NanoVault 300 is a quality 21-gauge steel lock-box for transporting your handgun for less than $40. The inside of the box has 1 1/4″ memory foam to protect the gun from getting dinged up.
The NanoVault 300 comes with a 1,500-pound test security cable. When the cable is wrapped around any fixed object and slid over the lock receiver inside the security box, both the NanoVault and any valuables will be securely attached.
The NanoVault meets TSA guidelines for transporting firearms on aircraft.
GunVault NanoVault Specifications:
- Model: NV300
- Width: 8.25 inches
- Height: 6 inches
- Depth: 1.75 inches
- Access: Combination lock
- MSRP $39.95


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I recently picked up a NanoVault myself, although mine is the smaller 100 variety, featuring a key lock instead of combination lock.
My review of the NanoVault 100:
http://www.spuler.us/gunsandammo/?p=85
I have this model that I keep under my jeep seat. I use it when I have to leave my gun behind, like when I go into the post office or the court house. It provides another layer of security when you have to leave a gun in the car. Works great.
I paid $29 for one on eBay. I use it for carrying a pistol in luggage, or locking a gun in the car. The included cable makes it easy to secure it in the spare tire compartment, out of sight.