prestashop developer needed for creating a module - Need immediately -- 2

Hello Developers, I need a module for add on items. Once you choose the items and proceed to checkout, there comes a pop-up window asking to ADD ON Items that less expensive or what ever. But there Add On Items can not be sold without choosing the actual products/items. Let me know if you have more questions. Need immediately. my budget is 30-45USD for this module Thanks