It's a lot easier than people make it out to be. First go back in time to when a sale had taken place and take the place of one of the people who managed to get some of the stock. This plan is fool-proof because in the future you know who is going to get the keys. Future fans, you're so dedicated!
In all seriousness sales can occur anywhere there is a way to post an invoice link. You may be at a meetup, on Discord, Instagram, Geekhack.org, reddit's /r/mechanicalkeyboards or /r/mechmarket, slack, or here on hungerwork.studio. One thing I can assure you is that if there isn't any information posted here regarding a sale then there is not currently any stock*. With the creation of this site and the calendar I now have a better centralized location for making updates.
*Please do not e-mail me or use the contact form to inquire about stock or leftovers!