Hi!
1 good thing is there is no sales tax in Oregon so you can save a little $$. Aside from what's been mentioned above my only other thought, if you feel up to it & have the time, is before you go, checking out local ads on Craig's list, Letgo & eBay to see if anyone in the Portland area has anything you may be interested in, you never know, you could get a great deal on something someone is really motivated to sell. There's also a lot of professional athletes that live in PO both current & retired, occasionally you'll find ads for things they just want to get rid of, never wore or maybe wore 1x.
I just realized you posted this back in April but thought I'd post it anyways incase you ever go back to Portland. Never hurts to have some xtra info. I hope you had a great time, it's very beautiful there esp in late spring thru summer, scored some good deals & ate some great food from the vast amount of amazing restaurants of all kinds!