Would never leave a gun in a vehicle, cheap or not. If you don't mind it being stolen, then mind that it might be used to harm an innocent somewhere because you left it so accessible to theft by a BG.
Before someone response with, but I have a solid titanium lock box welded to the vehicle. I stays there when I am at work or in school etc. That is an exception I can accept.
We're talking about an accessible, easily stolen gun I think. Right?
BTW - I hate the term "Saturday Night Special." That was a term coined by the gun grabbers. All these were/are, are more economical guns w/o bells and whistles, designed as entry level, less costly guns. Not everyone can afford $1500 and up for their first handgun.