Just taking a random chance here. Prices can be anywhere from $5-$15 but here are a few extras:
$2 per extra character, I can do up to 3 or maybe 4 characters but it'll will be $5 each.
Backgrounds are a extra $3.
Coloring an sketch would be $4 per-sketch.
If anybody is interested just shoot me a PM or if you have any questions post here and I'll answer them.