Hiller 12C for me is £1800 pa 3rd party insurance, 12GPH Fuel, £225 pcm hangarage, first year about £3K maintenance and annual. So very inexpensive as far as helicopters go.
Does not allow for any major parts required but so far not required.
Can put you in touch with a Hiller instructor in Florida and will be about USD $220 per hour. Much cheaper of course in the USA, I did both - depends how much time you can afford to be away from the UK.
Also although possibly selling mine at the moment would also consider a 3-4 share with the right people if it does not sell, which would make it incredibly inexpensive to operate. Based at Rochester in Kent EGTO.
Even if not interested in mine pm as can help if you decide a Hiller is right for you.