Unless you have an existing relationship with the maker, 
or have one of "their cues" in need of repair,
it might be difficult to find a cue maker with time enough to cater to basic repair requests; 
like installing a new tip. 
If you need something major done, or want a new matching shaft- 
that's when a cue maker is essential!
If you just need a tip replaced, and shaft and ferrule cleaned up, 
then it's best to visit a local repair person. 
I only have 1 person out here in my area that's allowed to touch my property; 
that isn't the cue maker personally. 
But, I'd trust this guy with any basic shaft repair! 
Some of his clean up work has been nicer than the original makers work.
I believe Billiard's Plaza is going to be your best bet. Strictly for convenience sake.
-Franky