What is a reasonable offer for job?

I currently work out of state (not in Texas) however I now have a interview in texas! yay! trying to get a good idea on what is a reasonable amount they should be offering to pay me.

I will be working in Labor and Delivery hopefully in Memorial Hermann System

I am a RNC-OB- certified inpatient obstetric RN
I hold a CLC- certified lactation counselor
I have 3 years experience in L&D 1 year med surg
I hold my BSN

Just not sure what is typical pay. Dont want to be underpaid or expect too much. I get basically nothign where I am at now so it's easy for me to jump at anything more than what i make now! TIA!