That depends on the version the online software you are using ----but generally state returns are $39 or $49
Currently state is $39 in the Online versions in Deluxe and above. Here is the page for Deluxe. Click on State Additional
https://turbotax.intuit.com/personal-taxes/online/deluxe.jsp
And How to review your feeshttps://ttlc.intuit.com/community/charges-and-fees/help/how-do-i-review-my-fees-in-turbotax-online/00/26353
If you have the fees deducted from your Federal refund there is an EXTRA $40 Pay with Refund service charge. ($45 in California). Which you can avoid by paying the fees upfront with a credit card.