Sounds kinda pricey to me. The MB list on the evap is $645 (plus the early units need a baffle added for $64) and we charge 23 hours labor. They probably want you to replace the drier for another $109 and you will need refrigerant.
Thats either a lot for labor or a lot for refrigerant.
I would suggest you find a good independent and save $1500 or more.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician