Count yourself lucky, that would cost you ~£80 down my way. Fortunately my work dental cover pays for any work I need doing Then again, my dentist doesnt use amalgam, he uses some funky white resin. And he doesnt just drill out the tooth, he then cleans it out, primer/etches it and then bonds in the resin, and colour matches it to the tooth in question.
Thats called being a posh Southerner! Us Northern scum are lucky if we don't get stuck with a Mercury filling!