Have never got a deer hide tanned yet, but have had a bull moose & 2 bull elk hides tanned with the hair left on.
We went through western fur tannery & if I remember correctly they charge per sq/ft & would also charge additional fees for salting if needed along with extra fleshing depending on how clean the hide is on inside of course.
I believe we paid anywhere from $650-750 per hide & all were dressed clean.
Also, just as nube said the waiting period there does take some time & did seem a bit pricey.
All in all we were happy with the end result.
Tanned elk hides with the hair left on look great on the wall.
The 2 elk were unique to get done as I took mine in archery season with my wife at my side 6 months pregnant & then to return a week & a half later to pick up our meat from the butcher but make the trip back worth while & set up the wall tent for a few days. We set up camp, went for a walk up the line the next morning & managed to call a bull in for her. She sent the shot home with the 300wby mag & got her first bull elk.
We have the two hides side by side on the wall & the antlers over the fireplace.
Looks great & brings back memories in the field each time I look & think back.
All the best in your search