Here is an idea for a spell somewhat in line with the content of the thread.
The spell is more about maintaining the face of the magus than about saving money.
The invisible Groom
ReCo 3
Range: Pers, Duration: Mom, Target: Ind.
Base 3
This spell instantly grooms the magus. It makes it so that the magus' hair is untangled, like it had been brushed, tidies up any beard, if the magus has one. The spell also makes the magus' nails look tidy and well trimmed. In addition the spell can cause signs of fatigue to disappear, such as removing pouches under the eyes, reducing wrinkles and fatigue induced ticks. With a Finesse+Ability roll it is also possible to get the magus' hair into a specific hairstyle (this is essentially craft magic that replaces the function of a hairdresser) though the hairstyle needs to either be self-upholding or the magus must secure it afterwards to prevent the hair from unraveling.
This spell is based on a guideline I extrapolated. I assumed that making the magus look unburdened by fatigue is at least easier than the MuCo equivalent of changing someones appearance entirely. Though this application falls under Rego since bodies can naturally have a groomed appearance and can naturally look well rested.
What are the applications of this spell:
I see this as a spell that magi would use on themselves if they are interrupted during an intense bout of study/lab work and need to make themselves presentable as you can cast this spell so quickly that even if you are surprised by a knock on your sanctum door you still have time to tidy up. It can also be useful to impress mundanes as a magus could come home from a quest completely exhausted and not appear that way.
Magi that care to can also use the following variation to have impossible and/or outrageous hairstyles:
The invisible Groom
ReCo 5
Range: Pers, Duration: Conc, Target: Part.
Base 3 +1 Conc +1 Part
This spell causes the magus hair/beard to assume any shape and form limited by 1) the actual volume of hair (i.e. it is not possible to shape the hair into a 2 meter tall tower on top of the magus' head unless the magus hair is already 2 meters long.) and 2) the magus' imagination (Finesse ability).
Since the spell is maintained the hairstyle does not naturally unravel until the magus loses concentration (or their maintaining the demanding spell runs out).
Applications:
Unless the magus in question had previously employed a barber/hairdresser this spell is unlikely to save a lot of money. It does however help in shaping the image of the magus. Which can be useful in many situations.