With this extension, You can add special price to product options.
Live demo
Admin Product Form
Front-end Product Page

Features

• Add unlimited special price to each value of each option.
  
• Set a different special price for each customer group
  
• Set a priority for each special price
  
• Set a date range (date start and date end) for each special price

Install Instructions
- Login to your OpenCart Administration panel
- Go to Extensions > Installer and upload zip file suited for your OpenCart version
- Go to Extensions > Extensions > modules > Special Price For Product Options > Install, Enable and save.
- Go to Extensions > Modifications and click Refresh
- Go to Dashboard > Developer Settings (gear icon) > Refresh

Free Installation and Support

• sabeti05 [AT] gmail.com
• DigitCart Support

No core files are changed or replaced.