If you're comfortable with doing some minor repairs you can handle replacing the resistor.
Drop the glovebox down. Open it up, and then release the top of it to drop the box completely down and out of the way exposing the heater box behind it. The resistor is mounted directly to the box with two 8mm screws and it will have two electrical connectors. All you have to do is unplug the connectors and remove the screws to remove and replace it. You can get one from a dealer or a parts store, either one will probably have the part in stock, and it will be cheap.