That's weird. You need to use the Desktop download program to amend a prior return. It should not cost anything. Nothing should be that much. $570 to Turbo Tax or the IRS or state? Are you using these steps?
How to Amend a prior year..
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
