Linda Cardellini, John Stamos and Scott Grimes, ER

How much do a few minutes with Dr. Ross cost? Almost half a million bucks.

NBC is seeking $425,000 for a 30-second ad spot on ER's April 2 series finale, Broadcasting & Cable reports. The long-running medical drama will wrap its 15th and final year with a two-hour extravaganza that features familiar faces in George Clooney, Noah Wyle, Anthony Edwards and other original cast members.

ER normally fetches $135,000 for a spot and brings in a cumulative total of $2,878,000 per broadcast.

The finale's bloated price tag marks the highest rate for an outgoing series since Everybody Loves Raymond bid adieu to the tune of $1.3 million, in 2005.

The ER farewell event starts at 8 pm/ET with a one-hour retrospective, before going into the two-hour episode.