The Falling Prices app is the way to get priority entrance at opening time for each Falling Prices location. You can also stay up to date with special announcements and offers.
Register for a free basic membership in the app to obtain free general line passes (#101 and above). Upgrade to to a Platinum membership to get added benefits for general passes and the option to purchase Premium line passes.
Premium line passes not only allow you to be #1-100 in line, but have even more benefits (see app for details).