It's pretty minimal for most (between $10 and $25) but the full color/detailed background pieces saw a substantial increase to bring them more into line with the time, effort, and materials that go into them.

I also need to make about $400 soon - so I need to sell either 16 single-character sketches, 8 badges or single-character fully-rendered pencils... or 2 single-character color/detailed background pieces XD