Well how's about, instead of offering 50% off for new clients you do it for existing clients?
If it's for new clients only you run the risk of them just coming in for the freebie, never to be seen again. You may also just attract the bargain hunters who are less likely to be loyal to you.
However, if you offer your regulars a good offer for a different treatment than their norm, they may like it enough to have again with their next appointment.
We've been doing this recently with our eyebrow shape clients. We've offered them a half price eyelash tint on their next appointment. 'Course, they've been so pleased with the results, they've booked again
. That's an extra £10.50. If you get 10 clients upgrading, that's an extra £105, (or whatever your prices are of course)
Or, you could always offer a 1/2 price back massage with a certain treatment
Or, 1/2 price facial with a full body massage
The possibilities are endless.
Also, by them combining their treatments, it keeps your treatment time down so it doesn't 'cost' you as much in lost appointment time.
edit
This is some of the wording on my current newsletter:
Whats New!
This month we say Goodbye to Kerry who is off to pastures new. Myself & Jo wish her well in her new job.
We say Hello to Hayley instead who is looking forward to meeting as many clients as possible. To help her in this quest we are offering some great deals when you book in with Hayley.
Wonderful Wednesday:
ALL treatments 1/2 price
Fabulous Friday:
Book 1 treatment & receive another 1 FREE
Spaces are limited on Wednesdays & Fridays so be quick & grab a bargain.