That sign should be in the $120-$180 range, however if you didn't give him a price upfront it might be a problem. If you claimed to be a professional sign maker then you could get even more. Most of my customers have a hard time understanding why something like that don't cost around $25 and like for you to come hang it for free. It's the Asian Mass Produced Syndrome (AMPS) that has come over this country.
Rob
Rob