Alteration costs?

For anybody in here who already got married, how much did you pay for alterations? The dress I tried on fit almost perfectly so I don’t need much taken in on the sides. It will need to be hemmed and I want to make detachable off the shoulder sleeves. The dress has a detachable bow I don’t want to wear so I plan to use that as the fabric for the straps. I’m just trying to put in my budget how much alterations will cost so I don’t get sticker shock when the time comes.