I have a big stainless pot I bought at Walmart. Not sure if you'd want something shipped. I think it's about 5 gallons or so, but can measure/photo if you're interested. I'd like 35 shipped. I think it was 50 some new.
I contacted Widmer, Portland, and McMenamins all via their respective webforms or email addresses.
So far I have only heard from McMenamins with an enthusiastic, helpful response. Unfortuneately, McMemamins does not use Sanke kegs. Still waiting to hear from the others. I have heard of the waiting list you mention. Hopefully it is not a myth.
Well try Rouge, I understand they are not exactly in PDX but can't hurt. Also stop by Reed College or anothercollege I am sure you could find a keggle or a keg you can make your own in. I know for a fact my brother and his friends at reed just collected old kegs to make a few keggles. Happy hunting.
Just keep checking craigslist. There are at least 2 per week on the list. I found several when I was looking. Just be patient, they come up all the time.