Cost to replace entry and screen doors??
Since this is a DIY site, we strongly discourage threads requesting "guesstimates" on pricing for contractors to do jobs. We can guide you on how to install the door, but price issues don't belong here.
There are waaaay too many variables that must be taken into consideration, and a carpenter's expert opinion after meeting with you and looking at the project will be much more accurate than any guess you get from people online.
I suggest getting at least three bids.