His Sideburns Can Smite You!
I've had clients try to do that >.< "I want a private lesson, but I only have $80. So can I just pay you that much instead or can I have half a lesson?" and then if you mention a payment plan, "Well..you see...I can't do that, because I'm not sure I want to pay the entire lesson amount."
Yeah, I got some of that when I first started doing commissions, but now I get a lot of people who go for my cheaper end items and a few who will buy the bigger stuffs as well, (yourself included)