Nice score! I love the promise and anticipation all wrapped up in a skinny twig with roots. The sooner you plant 'em, the sooner you can enjoy 'em! At least that's how I justify my purchases to my DH...haha.
You have the cutest yard there in the city!
What Thistle said about those roots, yep. Plant them to where they come off the trunk. That top couple inches of soil should be good fluff compost, and good fluff compost under. Watch for roots circling in the pot. If you see that, try to at least partially yank out the end of it. On the one I see a really nice angled graft.