RMC Web components have produced a range of Joomla Components and Modules. The first two are available here and versions are available for Mosets Hot Property, MisterEstate and EA-Imporved.

RMC Aavailability

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RMC-Availability is a calendar component enabling users with correct permissions (registered for example) to create/ maintain bookings through an availability calendar, the calendar will not allow double bookings and it has a speedy entry system bookings can be entered in blocks theses can be as short as a day or as long as you wish. Works for any Joomla component not just those mentioned above.

A demo version is available here 

http://rmcwebcomponents.com/component_demo/administrator/index.php

user demo

pass demo

The price of this calendar is less than the price of the Moset's original calendar and their newly released component Joomla 1.5