I'm going to negotiate the price, but I'm not going any lower than $100. I need to make a profit, but that won't allow me to at all. To cover the costs of supplies, mileage to get supplies, and shipping, that already equals to close to $100. If I add in what I charge for labor, which is about $10 an hour, ($40 for four hours of work), that rounds it out to roughly $130, which I then added a $20 profit margin, which is really, really small.
As a freelancer, my rates have increased. I had already quoted my price prior to going into this, and even though it was agreed upon, it still became a problem. The bottom line is this: if you want something done for nothing, go find an amateur on dA. Otherwise, expect to pay professional price for professional work.