I joined TMPC a few months ago but haven't ordered anything from them yet. Their "experiences" start at $99 - and they have a variety. Some are just a one-time curiosity, and others are much more involved (lasting weeks or even months). The descriptions sound VERY interesting... They also offer a quarterly publication that includes an ongoing story told with mysteries and puzzles - subscription is $25 annually, I think. It's free to apply to sign up, though, which gives you access to some of what they offer (but not all, apparently).