I picked up Nancy Gyes' Alphabet Drills, which I like a lot for working on various handling skills. It's nice when I don't have time to drag all my stuff out but still want to do something with the Stripey Dawg.
Years ago, I had bought Affordable Agility's travel jump set (4 practice jumps with a carry bag), so I haul those out to the neighbor's pasture (no nearby parks) and intersperse playing fetch with working through some of the drills. You can make those jumps fairly cheap (3 foot bars, uprights, made with 3/4" pvc pipe and I bought the single snap-on jump cups and jump base connectors from Clean Run). I'm up to 6 'travel' jumps and eventually I'd like to have 8 or more so I can do most the drills.