I bought an Airzooka:
Which, frankly, has been a very popular purchase at home.
I ran into almost everyone from my homeschool group. We all talked incessantly about everything we had seen and why we were using what. We attended seminars and compared notes. It's a great time to learn about new ideas and materials and services available to us today. It's overwhelming to the newbies, they think they need everything and stop at every booth. I sail by most booths and zero in on what I know I need and then spend some time looking at the new stuff.
My only other unplanned purchase (besides the Airzooka) was a tee-shirt for each of my kids. Katie's says simply, "Homeschool Girl". Ben's and Emily's each says, "Warning: Unsocialized Homeschooler. Proceed with conversation at your own risk" I love that!