You are best to have a go while it is still all fresh in your memory,
you could offer it at a cheaper price to begin with and to get the clients hooked then put it up to full price,
i was charging £12.50 per spray tan from January just to get them in the door and to get them hooked to the tantrick solutions,
i put my price back up in May to full price £25 per tan and they are still coming for the tans and i have not had one complaint about the price,
but i do explain to them that if they follow all after care advise they will get around 10 days from their tan, so they are all more than happy