I filed tax with you 1/27/2017, now have K-1 from wife's investment club & have to file amended return, how much does that cost?

That depends on what version you used to file your taxes. The K-1s are available with Premier or higher, so if you started in Federal Free, you would have to pay the full price of Premier. If you started with Deluxe, you would pay the difference between Premier and Deluxe.

https://ttlc.intuit.com/replies/5567856