Hello. For chibi sprites, I try to draw them around 32x32 pixels. I've drawn various JRPG pixel art creatures in that range which look like this (from my portfolio)
You can find more of my art on Cara. These sprites I'll typically charge around $50-100 per static sprite, then an additional $50-100 per animation they may have. If you'd like to speak more about this, please contact me here or on discord (imonk#8030).