Dental Charges

I know prices vary around the country and from vet to vet, so I am just after a rough guide to how much vets charge for a scale and polish.
I have noticed Milo is starting to get a build up of placque on a couple of his back teeth so want to get it sorted before he has any further problems.
I will ring the vets for an estimate tomorrow but in the meantime just wondered if any of you had recently had it done and what it cost.