The small pieces are available only as leftovers from other job, i.e. scrap. Finding a supplier who has that color, in that thickness, in a leftover piece is mostly a matter of luck. Now if you could be flexible about another color or pattern that is close, there could be lots of choices.
Here's a possibility, though. Lazydays RV in Tampa has a good selection of common RV corian patterns in their cabinet shop. I'm pretty sure I saw Aurora there (I have that color too) but that was a couple years ago now. You might contact Andrea Schielka in their Design Center to see if they have any. I don't know if they sell just the material, though. They like to do the fabricating as well. firstname.lastname@example.org