Mike,
This is Benjamin Edge speaking: a fellow Portlander/Milwaukian and collector of metal Royal (and Kirby) uprights.
You can search on eBay for stuff such as this.
I have three metal Royals myself: a model 880 (sold by Stark's, dated February 1985), a model 5000NA (another Stark's special, dated November 1987 - this is similar to the Royal 889 and 8000) and a 6103 Preferred Collection (dated February 1993).
~Ben (KirbyClassicIII)