what is the least expensive way to file an 1120-S using Turbo Tax?

[DoninGA]

There is only one way to complete and file a Form 1120-S using TurboTax.  You will need to purchase and download the TurboTax Business Edition.  The Business Edition can only be installed on a Windows based personal computer.  The Business Edition cannot be used for a personal tax return, Form 1040.

Go to this TurboTax website for the Business Edition - https://turbotax.intuit.com/small-business-taxes/cd-download/

[Opus 17]

The cheapest way is to purchase Turbotax Business as a download from an online discount retailer such as Amazon or Staples, and decline any add-on services.    Turbotax Business is available as an online service (browser-based), but it is more expensive and comes with higher levels or personal assistance from a CPA, which might be valuable for some people but costs more.