I find expos can be hit or miss. Disney certainly puts on big expos, but after going to a couple, there's nothing special in it, for me. I find a lot of the same vendors are there, so if they don't interest me, no thanks. Other expos are pretty small, which surprises me given the size of some races. It all depends on the organizers. A lot of times, vendors I'd like to see aren't at expos, so I stick to online shopping if I want something specific.
On a random note, has anyone done Acoustic Wave Therapy? I found out the new trouble spot is actually an extension of the ITB, and the pain is from build up of scar tissue. My chiro said AWT can break up the scar tissue much much faster than any manual technique.