Where can I buy a Shanghai transport card that will last 5 days from and how much does it cost?

Well, there is no 5-day pass, but you can buy a transport card and return it when leaving. CNY 20 needs to be paid as a deposit, but it will be returned.
It can be bought in many subway stations, like Pudong Airport, Nanjing Rd (E), Longyang Rd, People’s Square, Century Avenue…