Daxter, Socom, Syphon Filter, Ape Escape Academy and Pursuit Force demos are floating now on american ebay. They don't look like some kind of rare betas. Just normal, public demos. How people get these demos? Are they free at some stores or what? Next week I'm going to the NYC, so maybe I could somehow get demo of Daxter.
The Syphon Filter, SOCOM, and Ape Escape demos are available from Gamestop (and I would assume EB Games too), but they'd probably try to talk you into reserving a game to get one. Pursuit Force demos were sent out by Sony to Playstation Underground members, I'm not sure if you can get them in stores. This is the first I've heard of the Daxter demo, so I have no idea how to get one of those.