Deluxe was $39 federal and $39 for state before March 1. You could have paid then to lock in the early price. Price is determined at the time you pay or print or file.
See the Terms of Service for Online versions. Scroll way down to 2.3 Pricing
https://turbotax.intuit.com/corp/license/online.jsp
"Pricing for the various versions of the Services is determined based on the time when you pay to use a version of the Services. Depending on the version you choose, this will occur either when starting your use of the Services, when the preparation of your return is complete, or when your return is otherwise ready to be printed or filed....."
