Hi there,
I may be able to fix the plugin or use some parts of it's code, or I can build one from scratch, depends on what the plugin does and how complicated it would be to re create it. If it's something simple it might not be worth trying to fix the old one.
Let me know exactly what the plugin does, possibly include some screenshots from the website with and without plugin activated and describe the desired functionality and I'll be able to tell you more, possibly even drop the price.
Regards,
Julijan