X-23 has appeared in plastic form from Marvel Legends to Marvel Universe, but not in all her varied fan favorite costumes. Many have looked to remedy this for themselves by creating their very own figures of her.
You really have to look no farther than FigureRealm to see 90 custom made figures of her.
You can also turn to Youtube and see videos of amazingly well made custom figures.
Here are two from custom figure maker Hunter Knight.
Visit HunterKnightOnline to see more of this fan's work!
This one is from AnthonysCustoms.
Even the infamous Jin Saotome has done his rendition of Marvel Vs. Capcom 3 X-23 figure!
X-23 by *Jin-Saotome on deviantART
These are a just a few quick examples of the dedicated fan work on the plastic front available around the internet. You can find more on Toyark, MarvelousNews, and many more fan dedicated sites that handle action figure appreciation.