Price Sliders

Ok this maybe a little long winded but necessary to describe exactly want i require. I already have a Joomla 1.5 site powered by a yootheme template with a shopping cart. I require similar functionality to the sliders at this link below: [login to view URL] The cost price slider can either have its own admin interface or intergrated and compatible with my current shopping cart to produce a seamless checkout experience. I need the ability to enter any price increments. Example: Slider Deal 1 would start at £85 and Slider 2 would increase by increments of £5, please see attachment. The slider must have the ability to be placed in any module position. If there is anything you think i have missed or you have any suggestions then please don't hesitate to advise. I will need and approximate price and I will shortlist 3 developers and give full admin and ftp access to the site enabling you to analyse the source code of the shopping cart for integration. I will be wanting to start the project early January or late February. Thanks for taking the time to read this project.