Yeah I never think - we don't have one nearby where we live but I can order online and the postage is reasonable if you're ordering a few things at once =)
Mate of mine makes them - glass on glass. Do not buy rubber seals as they have been found to have a carcinogenic risk if the rubber comes in contact with food.
Trish recently replaced all the seals on her jars and they don't use rubber these days its some kind of plastic guaranteed safe for food use. I think she got them at either Lakeland or Wilkos.