If you truly, truly only need generic-CAD functionality, I recommend purchasing Carlson GIS with IntelliCAD. It’s the cheapest of all the desktop products and you can load this basic IntelliCAD menu:
by picking the IntelliCAD button from the Carlson Programs toolbar:
Extra Bonus! IntelliCAD is much closer to AutoCAD than AutoCAD LT… you’ll have much more functionality at a cheaper price! And, if you ever need a little bit of GIS, you can do that too.