Hello,
Hope you are well in the bless of God. I can say boldly that I am the right developer you are looking for. Because, I have +10years of experience in PHP and +5years of experience Drupal. I had developed more than 50s of website in Drupal. I have experience in Organic group, Simple newsletter, managing multi domain architecture, multi language, panels, layouts, views and VBO, Rules and components etc.
So I know exactly the perfect solution you need.
One question, do you want to increase the existing product price with some value or you want modify the current product price with some value?
Please, message me if you want a personal Interview and discuss with me.
It will be an honor for me if you hire me to do this job.
Thanks