Excuse me, what is the usual price of outsourcing development of flash games?

Start a company directly. The game app has to operate iterations. After finishing a version, the outsourcing company will leave it alone. It's not worthwhile for you to go to an outsourcing company for the second time. If you just have a good idea, don't enter the internet industry. See more and get in touch with people in the industry. There are too many dead projects.