The best replacement for expo is htc tilt 2.

The best alternatives to expo are rated as following:
★★★★★  htc tilt 2
★★★  quartet
★★★  comic con
★★★  pyra
★★  home depot
★★  tilt 2
★  anime north
★  otakon
★  dual rates
  worlds fair

Your alternative for expo is not listed? Suggest!
Speaking about expo, one probably shouldn't forget about pico projector.

Other search terms related to expo and their ratings are:
★★★★★ pico projector
You have in mind a companion for expo and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of expo in all years. Click on graph for more.
expo
htc tilt 2
quartet