Welcome!
I'm assuming you are looking to move after your Master's.
I actually lived in Portland, and can honestly tell you Craigslist is very popular / reliable there (as it can be) for housing.
Rent can run from low of $300 sublet to $1200+
Tulsa, OK?
http://www.skyscanner.com/transport/flights/tul/pdx/cheap-flights-from-tulsa-international-to-portland.html?oym=1408&iym=1408&rtn=1
Looks like your flight will run $330
Deposit, $300
The big issue is getting a job on arrival.
Unemployment: 6.3%
Looking for a long term job there will likely depend on who you get to know.
Picking up short term gigs can sustain you till a big job picks up, especially with the low rent in Portland. If you plan, you can take public transit, which runs every 15-30 minutes in most of Portland.
Estimated difficulty of move: medium-low