now i know the grief and death runewords are viable for ubers. I know greif is probably the cheapest runeword and death the most expensive for a zmiter. Since i'm kinda poor. are there any uniques or other cheap runewords that would make a good choice.
also need info on some uniques or runewords that do a lot of elemental damge for physical immunes,
Grief is where it's at. Failing that, you'll want to look for anything that's got a good crushing blow modifier. When you're doing ubers, you don't really need to look for something that does a whole lot of damage necessarily so much as something with CB 'cause that's how you'll smite down the big three.
Black is the cheap RW- a whole bunch of CB, and decent speed in a flail/scourge/knout. If you have all the CB you want and need more speed/surviablity lightsabre is nice for it's lightning absorb. It also works well against PI.
Black (Thul Io Nef), Kingslayer (Mal Um Gul Fal), Crushflange (33% CB I think), and Stone Crusher Legendary Mallet (40% CB) come to mind. Personally, I would use Black if short on resources. Kingslayer could be rather nice for its 33% CB, 50% Open Wounds, and Prevent Monster Heal.