Simple Invoicing System in PHP & MySQL

I need a Simple invoicing System with following (College Project) - Admin Logins - Customer Logins Functions CUSTOMER Customer should have a login When logged into Dashboard they should be able to see the product category dropdown list. Once category is selected the products related to that category should appear. Then they should select multiple products and order Once ordered a they should be able to generate a Proforma invoice related to the order. This is similar to Shopping Card concept. ADMIN - When an order is placed the admin should see a pop up / notification (Like in FB) - Admin should be able to add Categories and Products under each Categories from the backend - Stock Management (if a order has marked as delivered then Stocks must reduce) - Admin should be able to raise and invoice in PDF. (Should be able to select the Customer name) - When stock is less than 5 then a the item should be marked in red or highlighted. - Admin should be able to mark as Order status as Complete, Delivered, In Progress, Pending. - No emails be sent. - No IPG - No other major functions required. This is a simple program and some of you may already have a similar program. Should have done one PHP & MySql So looking for a Cheaper Price . Budget is $20 - $30