I have seen a lot of questions on this topic and a lot of solutions to the problem. I would like to propose a contest.
Who can build the cheapest heated base for a lubrisizer?
Here are some proposed rules:
Parts must be generally available. If you used a PID controller that your boss let you have from work (I use one on my melting pot), I suggest you price a comparable unit for judging purposes. Likewise heating elements, heating cartridges, lightbulbs, relays, bimetal thingies, dimmer switches, and inch-thick aluminum blocks. Your labor is free.
You have to actually build it.
You should tell us enough about your design that someone else could build it.
Come up with a bottom line price.
Judging is on your own. A really nice setup is worth more than an electric shockin' fire starter that takes 4 hours to get up to temperature. Consumer Reports manages to give high ratings to $50 cordless drills, "in their category," and we could probably manage. You know if you won.