On a whim, I went and checked out what is available at PK Park for the Civil War baseball series on May 17-18-19, and tickets are still there. Reserved tickets are available on Friday and Sunday in the reserved sections, and general admission still available on Saturday. I bought two reserved seats for $37 bucks in Section 11, just up from the visitor dugout. (Section 11, Row 11, Seats 11&12, to be precise). We should see how much orange we can get down there for the biggest series in the Pac-12 this year. We're driving down from Keizer (Salem), could be fun to carpool with some other Beaver fans.
Tickets are available on their website, or if you can't stomach typing the words "www.goducks.com", here's a handy link to go straight to the single game tickets.