Create a dropdown selection menu - 3 tier

My website is www.tonerline.co.uk. I am currently looking to integrate a product search feature into the site. On the front page.. where it says welcome to Tonerline, lowest priceson toners. I want to put in a printer ink model selection - a a 3 way menu drop down system, something similiar as seen on this site - [login to view URL] You can see where it says Select printer make/model/cartidge. I want that integrated into my site where the Welcome sentance is. I will provide a psd design and you will need to make it functional. How much will it cost and how long to complete the project?