Vaccination is the best course of action, it is highly worth ringing around your local vets and asking costs for vaccination, mention that you don't require a health check, just a vaccination, I'm not sure how many clinics would just charge for the vaccine, possible not many. But for a normal consult and vaccination you should be looking at or below $70.
Calicivirus is highly contagious and not only spreads through biting insects and contact with other rabbits, but survives well on the environment and can be spread simply by having your shoes come into contact with substrate that has the virus and then wearing those shoes back at home and around your rabbit. It has a short incubation period, and in most cases will cause death within 1-2 days. There really isn't a lot you can do once your rabbit has the virus, you can opt for a vet visit, but I would think that many vets would recommend a rabbit with confirmed diagnosis be put down, as the chance of survival is low and the animal would suffer a lot in the meantime. Having said that, I believe many rabbits die before symptoms become obvious enough to take counter measures.
Keep your rabbit indoors, if you go walking in parks etc where you know wild rabbits to be, as already suggested, leave your shoes outside and minimise contact of that outdoor clothing with your rabbit. Calicivirus is no joke, vaccination is absolutely crucial.
Symptoms can include; lethargy, uneasiness/excitement, loss of appetite, paralysis, convulsions and bleeding from mouth, nose and rectum. However it may spread so quickly that the rabbit dies without symptoms. It is fatal in approximately 70-100% of domestic rabbit cases.