You are comparing the Premier online edition price of $89 to the Deluxe desktop CD/Download edition price from a retailer.
https://turbotax.intuit.com/personal-taxes/online/
A retailer can charge whatever they want for the TurboTax software.
Purchasing the TurboTax Premier desktop CD/Download edition from the TurboTax website is $110. The Deluxe desktop CD/Download edition on the TurboTax website is $80
https://turbotax.intuit.com/personal-taxes/cd-download/
