I have 4 of the things living as a group with a 10 foot long by 5 foot wide house and 10foot square run, they get let out daily when I can keep an eye on them. Built it ourselves but it still cost close to £800 to set up with a second hand shed.
Love them but they are a pain in the arse to keep well. Need lots of cleaning, daily grooming for the long haired one, checking for fly strike daily or twice a day in summer, nails clipped every 6 weeks, fresh food, hay and pellets, daily spot cleaning, weekly full cleans. All of this and not one of them likes being held so you have to try catch them, do it all quickly and make sure they forgive you afterwards.
They are hilarious to watch especially when they are happy - binkies could never fail to make a person smile and they love a good head rub on their own terms. Interacting with them is always sat on the floor and on their terms, no holding allowed.
They can get some quite serious health problems, and ensuring they keep eating is essential, if they stop for any reason it becomes a major emergency requiring vet visits, syringe feeding and big vets bills. Fear, pain, illness, or stress can stop them eating and that develops into gut stasis.
If you got them from the RSPCA they would have had their vaccinations for the year and been neutered. So I would imagine the charge is more than you would pay in a pet shop but for very good reason and would save you money overall.
I enjoy keeping them but imagine a five year old would get bored quickly.
We but hay in square bales from the farm at around £5 a go and that lasts a month, pellets are £10 a bag but last a long time - you only feed a small amount of those, about an egg cup full per rabbit a day, then there is fresh herbs, veg and wild flowers which we grow ourselves for them.
We cut nails ourselves but if you need the vet nurse to do it they charge about £15 a go. Vaccinations we pay about £30 a year each I think, get a small discount for taking them all in at once.
Neutering was expensive. Insurance is £10 a month each at the minute but that doesn’t have high cover and I really would prefer a better if more expensive policy.
Other costs are mainly toys and entertainment - if you don’t give them enough to do they chew the house and run out of boredom, or start misbehaving in other ways.