PHP Developers Network

Hi everyone,
I am working on a retail management system for one of our client in Canada. The client don't have a high budget so we couldn't develop one from scratch. In these situations we use premium themes with single license. But in this case I have checked several inventory application themes but could not find anything as per the requirement. What the client requirement is to create a web application just like the Multiflex RMS ( https://multiflexrms.com ). Do you guys have had experience in working with similar products? Is there any themes available for retail management systems? Please share the links if any. Thanks