Shopping on price alone is dangerous. Some unethical operators do not hesitate to drop a reservation to pickup a better paying fare. Here are the are 4 standard types of limousines operating today at their relative cost per hour to rent. Wedding rates are usually are quoted at a 'package' price. Ask your limousine company what comes included in the package price.
Many smaller companies utilize older fleets.
Most companies require a minimum 2 to 4 hour booking when making reservations. If you are looking for a wedding limousine for only 1 hour, you will have to do some searching. Many companies simply will not do it because of cost considerations. If you do find a company that will do your wedding for 1 hour, more than likely the limousine will be an older model vehicle or in the off season. If you cancel your reservation, your deposit can be forfeited.