I have one. Sweet little snake.
I've only been to a few reptile shows in my day and typically they ARE kinda hard to find. However, this isn't a rarity thing, its a money thing. Few people breed them because they aren't a "cash crop" so to speak. They are also pretty plain looking (but don't let that stop you...all living things ahave a beauty of their own), so they aren't highly sought ofter.
When I found mine, there was only a few others for sale at the show...maybe 10 or so if you knew where to look. I bought mine as the only hatcling at the whole place. A whopping $15. Tiny little thing...about the width of my pinky finger nail. Took some looking to find a pinky small enough to choke down, but once she ate a couple, she grew large enough to take the regular sized. She's certainly grown since then.
They are definitely good eaters, although mine frequently goes off feed when approaching a shed. Sometimes for a month.
She's never bit anyone even, when smelling of mice, (but don't hold them by the back of the head), and very curious when taken out.
Unfortunately you also don't see them out on their own alot. She only comes out at night. But she doesn't mind being taken out either.
All in all a GREAT starter snake.