No, never just because it's cheaper. When you go for vaccinations, it's not the vaccinations alone that you are paying for but for a full healthcheck and MOT. This is the chance for your vet to be proactive in finding things going wrong before they do. Often it's at a vaccination appointment that things such as dental issues, skeletal, stomach, sight and hearing issues are discovered. A vet that is cheap isn't necessarily good and may miss these kinds of things.
A good vet is worth their weight in gold. And for those people who say to me, well I'll go for the vaccs to one vet becuase they are cheaper but go to a better one for emergencies, think on, because how will the emergency vet know your rabbit's history? They would be treating blind.