I gotta have 24 because of tapping so I got no choice.
Unfortunately, you can walk into just about any guitar store and count on one hand the amount of 24 fret guitars they have.

Even some of the biggest retailers look flumoxed when you ask to see what they have...although I guess there is a little self satisfaction when they say they haven't got any.
"No 24 frets?.. hmm, ok... well thanks anyway. Do you know where there are any 'good' guitar stores around"

Then I call for Jeeves and we leave in my limo.