When using Magento 2 with Shiptheory, it's now possible to have more flexibility in the price that is sent through to Shiptheory from Magento 2.
You can now choose the following options for the price which will pull through; Price, Price Including Tax and Original Price.
To access this setting, head into your Magento 2 settings page in Shiptheory, scroll down to the bottom and hit "Advanced settings":
If you then scroll down further, you will see an option to change this:
As explained in that image; Price is the standard price before tax has been applied. Price Including Tax is the final price which the customer will pay, with all tax included. Original Price is the price of the product before any alterations have been made to it, such as tiered pricing or catalogue price rules.
If you have any issues or questions there, please feel free to Contact Support.