For that you have to go back to mods that have been around for years and the classifieds if they are out of production now. My Provari's and REOs are in the ballpark of 7 years old and just as reliable as they were when purchased. I am certain there are other mods from that time in the same category.
A simple mech such as the REO just has less to break and is easier to repair on your own or with the help of a friendly machinist to make a part as they have no wires or chips.
Same goes for simple dripping attys,
I like to tell people their stash should include at least 2 good mech and at least 4 good dripping attys. THey should also learn what they need to know to use both of them SAFELY. Lots of good resources here on ECF and elsewhere on the net for that knowledge.
just my 2 cents