I want to find a photographer for my birthday party, but I don't know how much it will cost. What is the price? What kind of machine is effective? At that time,

That depends on your requirements for the effect. If it's just a record, stand-alone 500, HD 800 (depending on your local market price). If you want more effects, it's thousands. After filming, you can arrange for the cameraman to have a meal, or you can directly reimburse the round-trip fare and send it away.