Hi Evan, this response has been a long time coming (I haven’t enabled notifications for bbPress topics, I’m working on it).
If the file provided by your supplier includes a SKU or Product Name column then we can automatically link the Product and update its Price and Sale Price, adding support for *.dat files is easily done via a WordPress Filter so that it won’t be rejected. You can configure our CRON import engine to automatically import the changes each day via a Cron Job.
Feel free to open a Support ticket if you haven’t already so we can look at this together 🙂
