However, you can change image content if price is on image (not the URL of image, since that's part of the email that's already in the Inbox, but the binary image content that's located at the image URL) but this could be interpreted differently on different email clients.
Hi @raghavc - Have a look into services such as MoveableInk and Liveclicker. There a few companies that provide this kind of real-time service for emails. They can even hook into a client API securely to deliver the content in real time. Its not a free service, but can justify the uplift in clicks and conversions in some use cases.