Looks like you learned a lesson ... if you can open your eyes to it.
Let me put it this way ... had you offered $30, the guy would have then claimed he found someone for $20. He was gaming you.
It sounds counter-intuitive ... but such a person needs a HIGHER price, not a lower one. Save your sharp pencil for folks who have proven themselves good customers.
If he calls back, take the hard line: You've reconsidered, your price is $120. He missed his chance. You'll have to do it in the evening, as you now have another commitment. You also want his credit card # before leaving the shop. If he doesn't like it, he can go back to the phone book.
You might even suggest he go to a seminar at Home Depot. What you DON'T want is this clown wasting your time.
