The Jordanian Dinar is the only currency widely accepted in the country, although you can use credit cards pretty much anywhere apart from the smallest market stalls.
In cities such as Amman ATMs will dispense cash for UK Visa and Cirrus cards, although the charges can be quite high, and often the best way to get local currency is by using exchanging traveller's cheques and shopping around for the best rate.
Most prices are fixed in Jordan, and the only place where you'll be able to do any bargaining over goods is at the souks, although even there you're unlikely to get much off the starting price.
By western standards, Jordan is a fairly cheap country to visit, and you can get most things cheaper than in the rest of the region, and although alcohol is very expensive, a meal for two people can cost less than £5 in a local restaurant.
Most places add a service charge to the bill, so tipping is not necessary - and can cause offence.
