Where are you in Oregon and how far are you willing to travel? I have quite a few things I would be willing to give you in exchange for help digging and dividing.

I live in Portland. I wouldn't mind driving maybe 30 min away.
Where are you?

I'm afraid much more than 30 minutes...I'm south of Albany and southeast of Corvallis.

Check on craigslist or freecycle - there's frequently plants available through these sources. But there's also a timing factor involved.......late June is NOT an ideal time to be digging/dividing or transplanting plants and you can easily risk transplant shock by doing so. And that can be pretty discouraging to a new gardener to start out with stressed/failing plants. You'd have better luck if you waited until fall. You could take the time now to do some research into the type of plants you think you might like to try and/or improve your soil and planting areas in preparation. And it's not too late to try some fast growing annuals, like sunflowers, from seed.

I have theoretical extra plants - stuff that could be divided - and live in Portland, but won't be digging until the fall - if you want to get an idea of what I have, you could see things now and make notes for later. I'd follow Gardengal's advice - fall is way better, and it takes time to observe and prepare - better results if you take into account what would work best for your siting, shade or sun for what time of year, type of soil etc..