I have learnt a lot about marketing in the past year, and I now no longer do discounts, I do value added, so you offer a free treatment - say a file and paint - for any new clients. Do something that doesn't cost you a lot in product, and give it a time limit - say til end of September. This will (hopefully) make the client get round to actually booking her appt, and means your offer isn't just going on and on. The idea is the client then likes the file and paint and books again. You could also offer something more if they spend more - free manicure if you spend over £xxx - whatever you think. Good luck!