Upon paying your tour costs, you already paid the major expenses of your trip. However on the tour, you will have some personal expenses such as any meals on your own, souvenirs, and optional tips to your guides.
The local currency is the Jordanian Dinar (JOD) which has a fixed exchange rate with the United States Dollar (USD). Money can be exchanged at the airport upon arrival, in Amman, in major cities, and sometimes in hotels. Due to the fixed exchange rate is very cheap to exchange cash.