I don't know about Sumatra's, but I know my large fowl goes thru at least a bag of feed by that age. So I usually want at least $15. And depending on the breed, $25 is a very fair price. But, again I do not know the going rate of Sumatra's and the area that you live definitely has some say in what you charge. My Post Office is 5 mins away. I can see people driving 15 or 20 mins one way, and I would charge for my time.