That's about how much I was thinking. I did it a few times about a year ago for a friend and he tipped me about that much. I offered to do it for free of course if he provided the materials, but he didn't want to go through that. It'll be silly to offer your services for free (unless you're making something simple, or helping a noob). But looking for the materials and working through the calculations, you have to charge something.... If someone comes to me with the materials, and asks me to mod something I obviously don't charge.