On a more serious note.....
I figured I owed you a serious answer after the last post.
IMHO, the "quality" of the butt can very definitely make a significant difference in the overall "feel" of the cue.
You "could" order just a butt from any of the cuemakers on this forum (including myself), but I question whether it would be the "best" option. It's a buyer's market for cues these days. I'd look for a complete cue with the same joint type/size as your current shaft. That way you not only have a "better" butt....you have an extra shaft too. There are some real deals right now....just browse through the "Wanted / For Sale" section.
With that said, what pin size(type) and joint diameter are you looking for?