Digikey, catalog page 1516: TL88K50R0, 114W
There's a couple other ones that are also in the same ballpark - all are thick-film types.
err, corrected that - the data sheet has the inductance at 50-100nH, so if you're dealing with frequencies in the 10's of MHz, this resistor will start having a couple percent of error. I think I had some of the "power chip" parts made by the same company - they're a continuous sheet of resistive material deposited on ceramic.