Watchdog
Point it at something scarce. It tells you the second it appears.
A watcher for things that sell out: restocks, reservations, permits. Paste a link, set the keyword, and get pinged the moment it flips available — with a link that takes you straight there. Polite polling, always within site rules.
Pricing — up front, like it should be
Free: one watch, forever. $19.99/year unlimited · $9.99 for a 60-day pass when you only need it for one hunt.
Links
App Store link coming with release.