I'm in. I've got money and don't really care about the price:p
But honestly, it really depends on who the artist is and how much it costs and how long it will take. Kalamu is a great artist and she's done a pic for me before that i was very happy with^^, If she's doing this, i know it'll be worth it;)
Oh, and as other people said here, method of payment counts too. I will prefer paypal only. Unless i can hand the money over in person irl.
When i commission people, the price vary based on what i want. A rough sketch/line-art is usually 10 to 20 bucks, not much details. While a colored sketch/line-art is from 20 to 40 bucks(some details). A digital colored pic is usually between 40 to 50 bucks with the ones i commission(decent amount of details). I have also bought some high-detail commissions from people, both colored and b/w, and those are usually between 60 and 100 bucks, if not even more. But i've only paid 100 bucks tops. Other medias are more expensive. I've paid about 200 bucks for a big painting that uses acryl/oil-colors...