How much is Baidu information flow advertising promotion?

Generally, in baidu promotion, the 6800 account contains 5000 balance, and 1800 is their service fee. However, in our company, 2,400 accounts, including 2,400, are free of service charges. In fact, the conditions of Baidu account opening agent are also different. If you find the right price, which one to choose. The effect is the same, they are all pay-per-click.