What is the feeling or vibe that you're going for in your presentation? Most people I see do the floating table are really doing a table-shaped zombie ball.
Hence the loss of wonder when it comes to the traditional idea of the floating table. . . a seance/spiritualist effect. I'm not taking away from what Losander created in that it's a technical marvel, I just hate the routine due to personal bias and how said effect works best. . . and it's not for 10 year olds!
If I were you I'd simply bring in my own table and not worry about it. I'd also, given the kind of audience you say you'll have, just do it the traditional way OR BETTER YET. . . just do a Zombie or Astro Ball routine, which won't only come off far more as "enchanting" you can do more with them.