I was able to get 5k RT from PDX-STS. I bought it as two one ways though, for over a week the PDX-STS was 5k and STS-PDX was 20k.
The flight I was eyeing 7/1 had morning for 199 and evening 140. About a week ago price on evening flight dropped to 140 and both flights opened up for 5k redemption. Maybe part of a fare sale? There was quite a lot of inventory. 5 of us traveling home from a wedding were able to book over the course of an evening.
Sorry I wasn't looking at fare class when I was making the comparisons. What are you using to check fare classes?