I’m in the UK and my vets charged just under £50 plus VAT and he was given a motility drug injection so the price included that as well as a 24 hour pain killer injection. I can’t remember the exact price but it was under £100 so your price quote sounds about right to me.
I had leftover oral pain killers from my girl’s spay (she was spayed only 10 days before my boy) so I didn’t have to buy any but that would cost around a tenner.
I go to a ‘normal’ vets, rabbits in the UK aren’t considered exotic so as long as your vet is knowledgeable about bunnies, I wouldn’t worry. All I will say tho is if the vet tells you to fast him prior to surgery, find someone else.
At my vets, I think cats are the cheapest to neuter and rabbits are the most expensive (out of cats, dogs and rabbits)
Edit: I’ve no experience with the healthy pet plan scheme but it sounds pretty good. I have my bunnies insured but of course insurance doesn’t cover regular health checks, vaccinations and neutering/spaying. It’s great for emergencies tho!